Research Article |
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Corresponding author: Holger H. Dathe ( holger.dathe@senckenberg.de ) Academic editor: Stephan M. Blank
© 2023 Holger H. Dathe.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Dathe HH (2023) New insights into the taxonomy of the Hylaeus xanthostoma complex and further additions to the African Hylaeus fauna (Hymenoptera, Anthophila, Colletidae). Contributions to Entomology 73(1): 67-93. https://doi.org/10.3897/contrib.entomol.73.e102655
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Within the genus Hylaeus subgenus Deranchylaeus, from sub-Saharan Africa, a distinctive new subgroup of species is established. The females of this subgroup share a striking character: the orange-coloured lower face, previously known only in H. xanthostoma. The inter-specific differences are cryptic in both sexes. Seven species are newly described: Hylaeus (Deranchylaeus) aurantiacus sp. nov. ♀♂, H. (D.) burundis sp. nov. ♂, H. (D.) lyriformis sp. nov. ♂, H. (D.) sambiensis sp. nov. ♂, H. (D.) portokalius sp. nov. ♂♀, H. (D.) diastictus sp. nov. ♂ and H. (D.) jemeniticus sp. nov. ♀. This subgroup also includes H. (D.) promontorii (Meade-Waldo, 1923) and H. (D.) venustus Dathe, 2014, whose females are described for the first time. From Cameroon, the male of a second species of the subgenus Pumilaeus is described as new: H. (Pumilaeus) soukontouai sp. nov. New records of species of the genus Hylaeus F. in sub-Saharan Africa are added and a revised identification key to the subgenus Deranchylaeus is presented, to include the new species.
Deranchylaeus, Pumilaeus, identification keys, male terminalia, new species, taxonomy, subgroups, zoogeography
In the Afrotropical Region, the mostly small and inconspicuous mask bees of the genus Hylaeus remained for many years merely the subject of casual and haphazard observations, until Roy
Subgroup 2 also includes Hylaeus xanthostoma (Alfken), after which the subgroup is here named: in the female, the clypeus and other parts of the lower face including the mouth parts are orange-red, while the corresponding male has a quite conventional white or yellow mask. These females stood out in the entire subgenus Deranchylaeus because of this seemingly unique feature. However, after an in-depth examination of new material, it turned out that a number of closely-related species with orange-faced females exist, which differ only in cryptic morphological characters. The taxonomic treatment proved to be difficult, so that, in my opinion, only initial insights could be gained here. Five of the new species are available in only one sex and their collection localities are limited to eastern Africa, from Ethiopia to Burundi. In addition, there is an isolated record from the Arabian Peninsula, in Yemen.
This study is based on African Hylaeus newly acquired by the Linz-Dornach Biology Centre (OLML) and collected in Burundi, Cameroon, Congo, Ethiopia, Kenya, Namibia, Nigeria, Senegal, South Africa, Tanzania, Uganda, Zambia and Zimbabwe. Further material was again kindly provided by Alain Pauly (IRSNB/Arusha) and Connal Eardley (SANC/Pretoria). A total of about 450 specimens were studied.
The specimens were conventionally needle-pinned and the terminalia of selected males dissected and photographed. Most of the specimens were returned to the senders and are now in their collections; duplicates were retained in the SDEI collection as voucher specimens.
The collections mentioned are abbreviated as follows:
Basically, the morphological terminology of
The differences between the species of the xanthostoma complex are often rather cryptic and cannot be described verbally with sufficient precision. Accordingly, rather than following the usual practice of presenting the illustrations of each newly-described species in a separate plate, here the images of the diagnostically most important body parts – face, mesonotum, metasoma and terminalia – are grouped together, thus making comparison easier. These plates are supplemented by an identification key with references to the respective figures. Note that there are differences in the expression of the clypeus colouration, which can vary between rusty brown and light orange. The term “orange” is uniformly applied here to all these variants, because no transitions to the usual yellow and white colourations were observed.
The specimens were studied with a stereomicroscope Olympus SZX12. Light microscopic images were acquired with Leica Application Suite 4.12 through a Leica DFC450 camera attached to a Leica Z6 APO stereomicroscope or an Olympus BX51 microscope. In case of the Z6 APO, lighting was from the high diffuse dome illumination Leica LED5000 HDI. Composite images with an extended depth of field were created using the software Helicon Focus 8.2.0. Pro.
This chapter examines in detail these species defined by
Prosopis xanthostoma
Alfken, 1914: 196–197. ♀♂, Belgisch Kongo [DR Congo]. Lectotype ♀,
Hylaeus (Deranchylaeus) xanthostoma
(Alfken):
It took exactly 100 years to study this not uncommon species in detail (
Particularly, the female is conspicuous because of its long head accompanied by the extensive orange colouration of the face, which extends also to the supraclypeal area, the scapes, the paraorbital areae and lower areas of the head. The male morphologically closely resembles H. xanthostoma, but differs so markedly in the details of the terminalia (Figs
Male. N = 1. Total length 4.2 mm, wing length 3.0 mm.
Head (Fig.
Mesosoma (Fig.
Metasoma (Fig.
Female. N = 1. Total length 5.3 mm, wing length 3.5 mm.
Head (Fig.
Mesosoma (Fig.
Metasoma (Fig.
Hylaeus (Deranchylaeus) species, males. Head, frontal view. 1. H. (D.) aurantiacus sp. nov.; 2. H. (D.) xanthostoma (Alfken); 3. H. (D.) burundis sp. nov.; 4. H. (D.) promontorii (M.-W.); 5. H. (D.) lyriformis sp. nov.; 6. H. (D.) sambiensis sp. nov.; 7. H. (D.) portokalius sp. nov.; 8. H. (D.) venustus Dathe; 9. H. (D.) diastictus sp. nov. Scale bar 0.5 mm.
Holotype
♀, ETHIOPIA: Sidamo prov., 40 km W Sodo, 1130 m alt., 12.IV.2007. – Paratype ♂, same collection data. Both leg. J. Halada et coll.
Adjective: aurantiacus (lat.) – red-orange, orange-red.
The only available specimen, a male, has an orange-coloured mask, which was previously only known from females of the H. xanthostoma subgroup. Characteristic are also the terminalia, especially the open form of the genital capsule (Fig.
Male. N = 1. Total length 4.65 mm, wing length 3.05 mm.
Head (Fig.
Mesosoma (Fig.
Metasoma (Fig.
Holotype
♂ (single specimen), BURUNDI: Ruvubu National Park, Ruvubu River, 02°59'S, 30°28'E, 1401 m alt., 06.XI.2010, C. Eardley leg.; coll.
The species is named after its country of origin, Burundi (noun in apposition).
Prosopis longula
Friese, 1913: 583. 1 ♂, Rhodesia [Zimbabwe]: Bulawayo. Holotype
Hylaeus (Deranchylaeus) longulus
(Friese):
Hylaeus promontorii Meade-Waldo, 1923: nomen novum for Prosopis longula Friese, 1913 not Prosopis longula Pérez, 1903.
Hylaeus (Deranchylaeus) promontorii
Meade-Waldo:
The female is characterised by an orange mask restricted to the clypeus and lower face; scapes and legs are largely black. Apart from colour characters, the species differs from H. venustus and H. portokalius by its shorter head and stronger punctation of the mesosoma.
Female. N = 10. Total length 4.4–5.2 (4.77) mm, wing length 2.9–3.8 (3.41) mm.
Head outline (Fig.
Mesosoma (Fig.
Metasoma (Fig.
South Africa, Zimbabwe, DR Congo, Nigeria, Kenya, Mozambique. — New records: ETHIOPIA: 1 ♀, Sidamo prov., 50 km NE Yabello, 1540 m alt., 22.IV.2007; 2 ♀♀, Shewa prov., lake Lango, 29–30.IV.2007; 2 ♀♀, 20 km SE Konso, 05°15'N, 37°32'E, 850 m alt., 11.–13.V.2015; J. Halada leg. – TANZANIA: 7 ♂♂, 5 ♀♀, Morogoro prov., 50 km SW Morogoro, 06°50'S, 37°15'E, 450 m alt., 12.I.2007; 2 ♀♀, Shinyanga prov., 10 km NWW Kahama, 03°25'S, 31°47'E, 1200 m alt., 24.XII.2006; J. Halada leg. – MOZAMBIQUE: 1 ♂, Manicata prov., 70 km SE Chimoio, 23–24.XII.2003; J. Halada leg.; 5 ♂♂, 4 ♀♀, 8 km SW Vila Franca Save, 21.203°S, 34.507°E, 24.II.2020; 1 ♂, 15 km W Boane, 26.050°S, 32.229°E, 27.II.2020, M. Halada leg. – SOUTH AFRICA: 9 ♂♂, 4 ♀♀, KwaZulu-Natal, Hluhluwe 4 km S, 28°03'S, 32°16'E, 120 m alt., 20.XII.2019, J. Halada leg.; 1 ♀ Eastern Cape, Graeff – Reinet – Nieu – Bethesda, 28.I.2001; 1 ♀, Maputoland, SW of Emanguzi, 29.I.2003, M. Snižek leg. – NAMIBIA: 2 ♂♂, Otjozondjupa, 15 km NE Okahandja, 21°49'S, 16°58'E, 1480 m alt., 13.03.2014; 1 ♂, Kunene, 50 km NEE Khorixas, 20°51'S, 15°24'E, 1133 m alt., 24.III.2017; 2 ♂♂, Omaheke, 35 km W Gobabis, 22°23'S, 18°39'E, 1483 m alt., 07.IV.2017; 1 ♂, Khomas, 60 km NW Dordabis, 22°37'S, 18°07'E, 1500 m alt., 07.IV.2017; all J. Halada leg. – ZAMBIA NW: 3 ♂♂, 1 ♀, 40 km W Chingola, 12°27'S, 27°35'E, 1200 m alt., 07.XI.2005; 2 ♂♂, 100 km W Solwezi, 12°13'S, 25°39'E, 1400 m alt., 10.XI.2005; M. Halada leg. – ZIMBABWE: 1 ♂, Bubi env., Bubi river, 08.XII.1998, S. Bečvář et al. leg. All in coll.
Hylaeus (Deranchylaeus) species, males. Mesosoma, dorsal view. 10. H. (D.) aurantiacus sp. nov.; 11. H. (D.) xanthostoma (Alfken); 12. H. (D.) burundis sp. nov.; 13. H. (D.) promontorii (M.-W.); 14. H. (D.) lyriformis sp. nov.; 15. H. (D.) sambiensis sp. nov.; 16. H. (D.) portokalius sp. nov.; 17. H. (D.) venustus Dathe; 18. H. (D.) diastictus sp. nov. Scale bar 0.5 mm.
The data on the female of H. promontorii in
The striking and unique character is the excessive development of the distal lobus of the S7, which is lyre-shaped. The black scape with clearly demarcated apex spot is reminiscent of H. promontorii, but the gonoforcipes of the genital capsule are much moreslender. The mask is bright lemon yellow. The female is unknown.
Hylaeus (Deranchylaeus) species, males. Metasoma base, dorsal view. 19. H. (D.) aurantiacus sp. nov.; 20. H. (D.) xanthostoma (Alfken); 21. H. (D.) burundis sp. nov.; 22. H. (D.) promontorii (M.-W.); 23. H. (D.) lyriformis sp. nov.; 24. H. (D.) sambiensis sp. nov.; 25. H. (D.) portokalius sp. nov.; 26. H. (D.) venustus Dathe; 27. H. (D.) diastictus sp. nov. Scale bar 0.5 mm.
Male. N = 2. Total length 4.3–4.4 (4.35) mm, wing length 2.9–3.1 (2.98) mm.
Head piriform (Fig.
Mesosoma (Fig.
28–36. Hylaeus (Deranchylaeus) species, males. Terminalia. 28. H. (D.) aurantiacus sp. nov.; 29. H. (D.) xanthostoma (Alfken); 30. H. (D.) lyriformis sp. nov.; 31. H. (D.) promontorii (M.-W.); 32. H. (D.) portokalius sp. nov.; 33. H. (D.) burundis sp. nov.; 34. H. (D.) sambiensis sp. nov.; 35. H. (D.) venustus Dathe; 36. H. (D.) diastictus sp. nov. 37. Hylaeus (Pumilaeus) soukontouai sp. nov., terminalia. Rows: A. Genital capsule; B. Sternum 8; C. Sternum 7. Scale bar 0.5 mm.
Hylaeus (Deranchylaeus) species, males. Sternum 7, visualisation in transmitted light microscope with phase contrast. 38. H. (D.) promontorii (M.-W.); 39. H. (D.) portokalius sp. nov.; 40. H. (D.) tenuis (Alfken); 41. H. (D.) venustus Dathe; 42. H. (D.) lyriformis sp. nov.; 43. H. (D.) sambiensis sp. nov. Scale bar 0.5 mm.
Metasoma (Fig.
Holotype
♂, ETHIOPIA: Sidamo prov., near Bitata, 1480 m alt., 27.IV.2007, J. Halada leg.; coll.
New Latin, from lyra (lute, lyre) + forma (form, shape) – shaped like a lyre (adjectival).
The punctation of the thorax is similarly coarse to H. xanthostoma, but the mask is white, the mouthparts black. The species stands somewhat apart because of the rounded shape of the gonoforcipes (Fig.
Male. N = 2. Total length 4.55–4.65 (4.60) mm, wing length 3.10 mm.
Head nearly circular (Fig.
Mesosoma (Fig.
Metasoma (Fig.
Holotype
♂, ZAMBIA NW: Solwezi 100 km W, 12°13'S, 25°39'E, 1400 m alt., 10.XI.2005, M. Halada leg., coll.
Named after the country of origin, Zambia (latinised, adjectival).
Species from the species group of Hylaeus curvicarinatus, subgroup 2. The species is intermediate in colouration between H. promontorii and H. venustus, from each of which it differs only in subtle characters, especially in females. However, this study is based on a series collected in parallel, which support a distinction. Except in colour characters, H. portokalius differs from both species by its longer head and finer punctation of the mesosoma. The males are recognisable by their short scapes (ScL:ScW 1.5 vs. 1.8 in H. promontorii); in the females, the orange colouration is restricted to the lower part of the head; scapes and femora are extensively black.
Male. N = 10. Total length 4.0–4.4 (4.22) mm, wing length 2.6–2.8 (2.73) mm.
Head trapezoidal (Fig.
Mesosoma (Fig.
Metasoma (Fig.
Terminalia (Fig.
Female. N = 7. Total length 4.4–5.0 (4.64) mm, wing length 3.0–3.4 (3.16) mm.
Head elongated trapezoidal (Fig.
Mesosoma (Fig.
Metasoma (Fig.
17 ♂♂, 7 ♀♀. Holotype ♂, ETHIOPIA: Sof Umer, 06°54'N, 40°51'E, 1200 m alt., 30–31.V.2015, J. Halada leg., coll.
Excluded from types: SENEGAL: 10 ♂, Dakar, 18.VII.2004, M. Halada leg. First record for Senegal.
The species belongs to the group of females with an orange mask; πορτοκάλι (modern Greek) – orange (latinised, adjectival).
Hylaeus (Deranchylaeus) venustus
Dathe, 2014: 73–74. ♂, Kenya. Holotype
It is the brightest form in the group; ♂ with bright yellow mask (Fig.
Female. N = 10. Total length 4.2–4.9 (4.53) mm, wing length 2.7–3.1 (2.97) mm.
Head outline round-cordate (Fig.
Mesosoma (Fig.
Metasoma (Fig.
Kenya. — New records: KENYA: 1 ♀ Voi env., Tsavo, 8–18.XI.1996; 6 ♂♂, 4 ♀♀ ibid. 23.III.–4.IV.1997; 2 ♂♂, 8 ♀♀ ibid., 11–14.IV.1997; 4 ♀♀ ibid., 16.V.2007; 6 ♂♂, 4 ♀♀ E Mwingi, Kangonde wadi, 18.IV.2007, all M. Halada leg.; 1 ♀ Nguni, N of Ngomeni, 27.IV.2008, M. Snížek leg. — All coll.
Unlike most other species of the subgroup, the mesonotum is densely and finely punctate. The short, compact genital capsule with the separated, short-spatulate ends of the gonoforcipes has some resemblance to Hylaeus tenuis, whose mesosoma, however, is much more strongly punctate.
Male. N = 1. Total length 4.20 mm, wing length 2.9 mm.
Head (Fig.
Mesosoma (Fig.
Metasoma (Fig.
Holotype
♂ (single specimen), ETHIOPIA: Sidamo prov., ca. 50 km NE Mega, 1420 m alt., 24.IV.2007, J. Halada leg.; coll.
Named after the comparatively fine punctation; διαστικτος (Greek) – finely dotted, speckled (adjectival).
Prosopis simplex
Bingham, 1912: 381–382. 1 ♀. South Africa. Holotype
Prosopis tenuis
Alfken, 1914: 188–189. ♀♂, South Africa. Lectotype ♂
Hylaeus (Deranchylaeus) tenuis
(Alfken):
This species is treated in detail by
KENYA: 1 ♂, SE Voi, 18.V.2007, M. Halada leg. – SOUTH AFRICA: 1 ♂, KwaZulu Natal N, Tembe Elephant Park, 08.XII.2002, M. Halada leg. – TANZANIA: 1 ♂, Arusha distr., Naberera env., 08–13.IV.1997, M. Kuboň leg.
Females with an orange clypeus were not previously known to me from the Palaearctic. This species apparently has a close connection with geographically neighbouring Ethiopian species (e.g. H. portokalius). The male is unknown.
Female. N = 1. Total length 4.40 mm, wing length 3.00 mm.
Head (Fig.
Mesosoma (Fig.
Metasoma (Fig.
Holotype
♀ (single specimen), YEMEN SW: 20 km S Taizz, 13°30'N, 43°57'E, 1200 m alt., 24.X.2005, J. Halada leg.; coll.
Named after the country of origin Yemen (adjectival).
Subgenus Alfkenylaeus Snelling, 1985
Prosopis arnoldi
Hylaeus
(incertae sedis) arnoldi (Friese) –
Hylaeus (Alfkenylaeus) arnoldi
(Friese) –
Botswana, Kenya, Mozambique, Namibia, Zimbabwe. New to ETHIOPIA: 1 ♀, Sof Umer, 06°54'N, 40°51'E, 1200 m alt., 30–31.V.2025 J. Halada leg.
Hylaeus (Alfkenylaeus) acariphorus
Snelling, 1985: 14. ♂♀, Zimbabwe. Holotype ♂, SAM Cape Town –
Ethiopia, Kenya, Mozambique, Zimbabwe, South Africa. Supplementary records: ETHIOPIA: 8 ♂♂, Sof Umer, 06°54'N, 40°51'E, 1200 m alt., 30–31.V.2025, J. Halada leg.
Subgenus Cornylaeus Snelling, 1985
Prosopis aterrima
Friese, 1911: 127. ♂♀, South Africa. Lectotype ♂
Hylaeus (Cornylaeus) aterrimus
(Friese) –
Hitherto recorded from Congo Republic, Mozambique, South Africa and Zimbabwe. New to ZAMBIA: 4 ♂♂, 50 km E Mwinilunga, 11°43'S, 24°47'E, 1400 m alt., 18.X.2008; 1 ♂, 40 km W Chingola, 12°27'S, 27°35'E, 1200 m alt., 07.XI.2005; 2 ♂♂, 1 ♀, 100 km W Solwezi, 12°13'S, 25°39'E, 1400 m alt., 10.XI.2005; all M. Halada leg. Supplementary records: MOZAMBIQUE: 1 ♀, 65 km S Vlóngné, 15°13'S, 34°19'E, 1250 m alt., 08.XII.2005, Kadlecová leg.; 1 ♀, Tete prov., ca. 65 km S Ulongue, 08–10.XII.2005, A. Kudrna leg.
Subgenus Metylaeus Bridwell, 1919
Prosopis bouyssoui
Vachal, 1900: 535. ♀, Gabon. Lectotype ♀
Hylaeus (Metylaeus) cribratus
(Bridwell) –
CONGO: 1 ♀, Sangha prov., 7 km SW Mokéko, 01°30'N, 15°55'E, 420 m alt., 31.X.2016, J. Halada leg.
Metylaeus cribratus
Bridwell, 1919: 131. ♀♂, Nigeria. Holotype ♂
Hylaeus (Metylaeus) cribratus
(Bridwell) –
Widespread and relatively common species; recorded from Angola, Benin, Botswana, Burkina Faso, DR Congo, Ethiopia, Gabon, Cameroon, Kenya, Malawi, Mozambique, Namibia, Nigeria, South Africa, Uganda and Zimbabwe. New for the Republic of CONGO: 1 ♀, Plateaux prov., Gamboma env., 01°53'S. 15°51'E, 300 m alt., 22.X.2016, J. Halada leg. – ZAMBIA: 4 ♂♂, 40 km W Chingola, 12°27'S, 27°35'E, 1200 m alt., 07.XI.2005; 1 ♀, 140 km NE Kapiri Moshi, 13°31'S, 29°48'E, 1500 m alt., 23.XI.2005, all M. Halada leg. Supplementary records: ETHIOPIA: 3 ♂♂, Sof Umer, 06°54'N, 40°51'E, 1200 m alt., 30–31.V.2025, J. Halada leg.; 1 ♀ Oromia State, Borena Region, 10 km SE Negele env., 14°18'N, 39°38'E, 1470 m alt., 19.XI.2014, P. Kučera leg. – KENYA: 1 ♂ Voi, 16.V.2005; 1 ♂ E of Thika, SW Kangonde, 28.XII.2007, M. Halada leg. – TANZANIA: 1 ♀ Dodoma prov., 30 km E Dodoma, 05°54'S, 35°45'E, 1100 m alt., 14.12.2006, J. Halada leg.; 3 ♂♂ Morogoro prov., 50 km SW Morogoro, 06°50'S, 37°15'E, 450 m alt., 12.I.2007, J. Halada leg. – MOZAMBIQUE: 1 ♂ 15 km SSE Manje, 15°29'S, 23°16'E, 500 m alt., 02–04.XII.2005; 1 ♂ 15 km SE Save, 21°13'S, 34°40'E, 65 m alt., 18–19.XII.2005, both J. Halada leg.
Prosopis scutispina
Alfken, 1914: 195. 1 ♂, Zimbabwe. Holotype
Hylaeus (Metylaeus) scutispinus
(Alfken) –
Benin, Botswana, Burkina Faso, Central African Republic, Kenya, Malawi, Mozambique, Namibia, South Africa, Zimbabwe. – New to SENEGAL: 3 ♂♂, 20 ♀♀, 70 km W Tambacounda, 13°57'N, 14°16'W, 29.VI.2004, M. Halada leg.
Subgenus Pumilaeus Dathe, 2015
This dainty species from West Africa is well recognisable by its distinct tricolouration; the curious arolia (pulvilli) deserve mention as conspicuously shiny white structures, from which one might suppose a special hitherto unknown function.
Male. N = 2. Total length 4.25–4.60 mm, wing length 3.00 mm.
Head (Fig.
Mesosoma (Figs
Metasoma (Figs
Holotype
♂, CAMEROON: Meiganga, 06°33'N, 14°15'E, 1103 m alt., 08.I.2016, Y. B. Soukontoua leg., coll.
Named after the collector of the species, Yves Bertrand Soukontoua (Ngaoundéré, Cameroon and Ghent, Belgium), latinised.
Collected on Lophira lanceolata (dwarf red ironwood, family Ochnaceae).
This species does not readily fit into any of the better-known indigenous subgenera. The subgenus Deranchylaeus is, however, avowedly a repository for otherwise unassignable African species (
They share the membranous distal lobes of sternum 7, the apically bipartite sternum 8 and the compact genital capsule with the penis valves flat on top; the scapes are brightly coloured and the terga have terminal fringes. Interestingly, these characters are equally found in a species from Oman, which I recently described as H. (Paraprosopis) samhanicus Dathe, 2022. Similarities between the fauna of the north-eastern Afrotropics and that of the Arabian Peninsula are known (“Ethiopian Region”), but some more data would be needed before a species from West African Cameroon could be assigned to this distributional type.
Subgenus Deranchylaeus Bridwell, 1919
Prosopis alfkeni
Friese, 1913: 35, 583. ♂, Zimbabwe. Lectotype
Hylaeus (Deranchylaeus) alfkeni
(Friese, 1913) –
NAMIBIA: 1 ♂, Kunene, 50 km NEE Khorixas, 20°51'S, 15°25'E, 1133 m alt., 24.III.2017; 1 ♂, 1 ♀, Karas, 80 km N Aus, 26°05'S, 16°37'E, 1550 m alt., 01.IV.2017, J. Halada leg.
Hylaeus (Deranchylaeus) amharicus Dathe, 2014: 25. ♀, Ethiopia. Holotype IRSN Brussels.
ETHIOPIA: 2 ♀♀, Holeta Station, 9°04'N, 38°30'E, 2450 m alt., 07.V. and 17.IX.2012, Zewdu & Pauly leg.
Prosopis capicola
Alfken, 1914: 186. 1 ♀, South Africa. Holotype
Hylaeus (Deranchylaeus) capicola
(Alfken, 1914) –
SOUTH AFRICA: 1 ♂, Maputoland, SW of Emanguzi, 29.I.2003, K. Snižek leg. – SIMBABWE: 1 ♂, Manicaland prov., Chirinda Forest Res., Mt. Selinda, 20°25'S, 32°43'E, 1000 m alt., 02–06.XII.2015, J. Halada leg. First record for Simbabwe.
Hylaeus (Deranchylaeus) chimani
Dathe, 2014: 31. ♂, Zimbabwe. Holotype
Previously only known from Zimbabwe. New for TANZANIA: 1 ♂, Manyara prov., Mts Hanag, 30 km SW Babali, 04°23'S, 35°25'E, 2000 m alt., 12.XII.2017; 1 ♂, Mbeya prov., Mbeya City, 05.I.2007, both J. Halada leg.
Prosopis curvicarianata
Cameron, 1905: 234. ♂, South Africa. Lectotype
Hylaeus (Deranchylaeus) curvicarinatus
(Cameron, 1905) –
SOUTH AFRICA: 2 ♂♂, 2 ♀♀, Cape prov., 25 km N Jansenville, 32°49'S, 24°44'E, 600 m alt., 04.I.2010. – NAMIBIA: 3 ♂♂, Karas, 80 km N Aus, 26°05'S, 16°37'E, 1550 m alt., 01.IV.2017, J. Halada leg. First record for Namibia.
Prosopis dregei
Strand, 1912: 27. 1 ♂, South Africa. Holotype
Hylaeus (Deranchylaeus) dregei
(Strand, 1912) –
SOUTH AFRICA: 1 ♀, East Cape, 10 km SE Alexandria, Nat. Res., 28–31.I.2000, J. Halada leg.
Hylaeus (Deranchylaeus) eardleyi
Dathe, 2014: 37. ♂♀ South Africa. Holotype ♂
Ethiopia, Kenya, Mozambique, Zimbabwe, South Africa. New records MOZAMBIQUE: 4 ♂♂, 8 km SW Vila Franca Save, 21.203°S, 34.507°E, 24.II.2020, M. Halada. – SOUTH AFRICA: 5 ♂♂, 2 ♀♀, KwaZulu Natal, Hluhluwe 4 km S, 28°04'S, 32°17'E, 120 m alt., 20.XII.2019, J. Halada leg.
Prosopis gabonica
Vachal, 1900: 536. ♀, Congo. Lectotype
Hylaeus (Deranchylaeus) gabonicus
(Vachal, 1900) –
CAMEROON: 6 ♂♂, 5 ♀♀, North-West prov., E env. of Big Babanki, 06°07'N, 10°16'E, 1200 m alt., 05–13.III.2008, M. Řiha leg. 7 ♀♀, Meiganga, 6°33'N, 14°15'E, 1103 m alt., 07.VII.– 30.IX.2014; 12 ♂♂, 6 ♀♀, 01–05.I.2016, all Y.B. Soukontoua leg. – ETHIOPIA: 1 ♀, SNNPS State, Arba Minch NP, 06°02'N, 37°35'E, 1180 m alt., 04.IV.2016, J. Halada leg. – CONGO: 1 ♂, Sangha prov., 20 km SW Cabosse, 02°00'N, 13°54'E, 530 m alt., 02.XI.2016; 1 ♀, Plateaux prov., 20 km S Lékana, 02°29'S, 14°37'E, 465 m alt., 08.XI.2016, J. Halada leg. First record for Ethiopia.
Hylaeus (Deranchylaeus) gessianus Dathe, 2014: 41. ♂♀, Namibia, South Africa. Holotype ♂ Albany Museum, Grahamstown.
Namibia, South Africa. New records: NAMIBIA: 2 ♂, Karas prov., 80 km N Aus, 26°05'S, 16°37'E, 1550 m alt., 01.IV.2017, J. Halada leg.; 1 ♀, 15 km E Swakopmund, 04.II.1993, J. Gusenleitner leg.
Hylaeus (Deranchylaeus) haladanius
Dathe, 2015: 12. ♂♀, Burundi. Holotype ♂
Burundi, Cameroon, Central African Republic, Nigeria, South Africa, Zambia. New records: CAMEROON: 1 ♀, Meiganga, 6°33'N, 14°15'E, 1103 m alt., 18.VIII.2014, Y.B. Soukontoua leg. – CENTRAL AFRICAN REPUBLIC: 1 ♂, 85 km NW Bangui, 04°46'N, 18°04'E, 380 m alt., 04.IV.2010. – NIGERIA: 1 ♀, Gashaga Gumfi NP, 25 km SW Serti env., 07°20'N, 11°13'E, 400 m alt., 09–13.V.2011. – TANZANIA: 1 ♀, Shinyanga prov., 100 km NWW Kahama, 03°25'S, 31°47'E, 1200 m alt., 24.XII.2006. All J. Halada leg. First record for Tanzania.
Prosopis leucolippa
Friese, 1913: 574. 1 ♂, Namibia. Holotype
Hylaeus (Deranchylaeus) leucolippus
(Friese, 1913) –
Namibia, South Africa, Zimbabwe. New records: NAMIBIA: 1 ♂, Erongo Usakos 1–5 km E, 21°58'S, 15°36'E, 900 m alt., 16.III.2014, J. Halada leg.
Hylaeus (Deranchylaeus) lightfooti
Bridwell, 1919: 137. ♀♂, South Africa. Holotype ♂ USNM Washington –
South Africa, Zimbabwe. New records: SOUTH AFRICA: 3 ♂♂, Western Cape, Mossel Bay, route Herbertsdale – Langberg, 19.I.2001; 1 ♂, Western Cape, N of Knysna, Prince Alfreds pass env., 23.I.2001, M. Snižek leg.
Prosopis melanosoma
Cockerell, 1920: 305. ♀♂, South Africa. Holotype ♀
Hylaeus (Deranchylaeus) melanosoma
(Cockerell, 1920) –
South Africa, Burundi, Zimbabwe. New records: SIMBABWE: 1 ♂, 8 ♀♀, Manicaland prov., Chirinda Forest Res., Mt. Selinda, 20°25'S, 32°43'E, 1000 m alt., 04.XII.2015, J. Halada leg. – UGANDA: 1 ♀, W Kasese, 10 km Kilembe, 1800 m alt., 21.XI.1994, M. Snižek leg. First record for Uganda.
Hylaeus (Deranchylaeus) oromialis Dathe, 2014: 56. ♂♀, Ethiopia. Holotype ♂ IRSN Brussels.
BURUNDI: 3 ♀♀, PN Kibira, 2°55'S, 29°30'E, 2200 m alt., 04–08.VIII.2014, A. Mpawenimana leg.; 1 ♀, ibid., Mt. Teza, 03°16'S, 29°33'E, 2400 m alt., 1 f+, ibid., Sec Rwegura, 02°5"S, 29°30'E, 2400 m alt., both 01–17.VII.2015, L. Ndayikeza leg. – ETHIOPIA: 1 ♂, Holeta Station, 9°04'N, 38°30'E, 2450 m alt., 09.X.2012, Zewdu & Pauly leg. First record for Burundi.
Prosopis perater
Cockerell, 1936: 4. ♀♂, Congo. Holotype ♀
Hylaeus (Deranchylaeus) perater
Cockerell, 1936 –
Congo, Eritrea, Ethiopia, Kenya, Zimbabwe. New records: BURUNDI: 1 ♂, PN Kibira, Sec Rwegura, 02°55'S, 29°30'E, 2200 m alt, 17–21.VII.2015, L. Ndayikeza leg. – ETHIOPIA, 1 ♀, Holeta Station, 9°04'N, 38°30'E, 2450 m alt., 06.II.2012; 1 ♂, ibid., 28.IV.2012; 4 ♀♀, ibid., 08–15.V.2012; 1 ♀, ibid., 08.IX.2012; 3 ♀♀, ibid., 09–15.IX.2012; 1 ♀, ibid., 16–30.X.2012; 1 ♀, ibid., 06.XI.2012; all Zewdu & Pauly leg. 2 ♀♀, Oromia, Ghedo, 9°01'N, 37°27'E, 2400 m alt., 01–30.XI.2013, Hora & Pauly leg. – UGANDA: 1 ♀, W Kasese, 10 km Kilembe, 1800 m alt., 21.XI.1994, M. Snižek leg. First record for Burundi and Uganda.
Prosopis robertiana
Cameron, 1906: 324. ♂, South Africa. Holotype
Hylaeus (Deranchylaeus) robertianus
(Cameron, 1906) –
Kenya, Tanzania, Burundi, Malawi, Zimbabwe, South Africa. New records: CENTRAL AFRICAN REPUBLIC: 1 ♀, 40 km E Bambio, 03°60'N, 17°12'E, 500 m alt., 09.XI.2012; 1 ♀, 32 km NW Mbaiki, 21–22.XI.2012. – CONGO: 1 ♀, Plateaux prov., Gamboma env., 01°54'S, 15°51'E, 300 m alt., 22.X.2016; all J. Halada leg. – ETHIOPIA: 1 ♀, Gamo Gofa prov., 45 km S Arba Minch, 1200 m alt., 15.IV.2007, J. Halada. – SOUTH AFRICA: 1 ♂, Pretoria City, 12.II.2000, J. Halada leg; 1 ♂, Western Cape, K Karoo mer., Langberg env., 24.XI.2002, M. Snižek leg. – TANZANIA: 1 ♀, Mbeya prov., 20 km S Vwawa, 09°12'S, 33°04'E, 1880 m alt., 07.XII.2017, J. Halada leg. – ZAMBIA: 2 ♀, W of Solwezi, 12°10'S, 25°33'E, 1300 m alt., 22.X.2008, M. Halada; 1 ♀, 90 km Solwezi, E of Chisasa, 09.IX.2005, M. Snížek. New to Ethiopia, Congo and Zambia.
Prosopis rugipuncta
Alfken, 1914: 192. ♀♂, South Africa. Lectotype ♂
Hylaeus (Deranchylaeus) rugipunctus
(Alfken, 1914) –
Uganda, South Africa, Namibia. New records: SENEGAL: 1 ♂, 70 km W Tambacounda, 13°58'N, 14°16'W, 29.VI.2004, M. Halada leg. – SOUTH AFRICA: 1 ♀, Western Cape, N of Cape Town, 33°46'S, 18°23'E, 70 m alt., 07.XII.2007, M. Riha leg.; 1 ♀, Limpopo prov., Waterberg BR, Marken env., 23°36'S, 28°23'E, 10 m alt., 26.XI.–15.XII.2015, J. Halada leg. First record for Senegal.
Hylaeus tinctulus
Cockerell, 1932: 172. ♂♀, Congo. Holotype ♂
Hylaeus (Deranchylaeus) tinctulus
Cockerell, 1932 –
Congo, Burundi. New records: BURUNDI: 1 ♀, PN Kibira, Mt. Teza, 03°16'S, 29°33'E, 2400 m alt., 02–13.II.2015; 3 ♀, ibid., 02–13.III.2015; 2 ♀♀, 16–31.III.2015; 1 ♀, 18.IV.2015; 1 ♂, 3 ♀♀, ibid., 03–27.V.2015; 1 ♀, ibid., 01–12.06.2015. 2 ♂♂, PN Kibira, Sec Rwegura, 2°55'S, 29°30'E, 2200 m alt., 01–17.X.2014; 2 ♂♂, ibid., 10–28.XI.2014; 1 ♂, 1 ♀, ibid., 01–31.XII.2014; 2 ♂, 3 ♀, ibid., 01–27.II.2015; 1 ♂, 5 ♀♀, ibid., 02–13.III.2015; 2 ♀♀, ibid., 01–17.IV.2015; 2 ♂♂, 1 ♀, ibid., 04–31.V.2015; 4 ♂♂, 1 ♀, ibid., 01–30.VI.2015; 1 ♂, 4 ♀♀, ibid., 01–30.VII.2015. 1 ♀, PN Kibira, Secteur Muremera, 03°03'S, 30°30'E, 1654 m alt., 23–27.II.2015. 1 ♂, PN Kibira, Secteur Teza, 3°33'S, 29°32'E, 2342 m alt., 08.III.2015. All L. Ndayikeza leg. – CAMEROON: 1 ♂, North-West prov., Kefen Forest, 6 km E Bambui, 06°02'N, 10°17'E, 1800 m alt., 13–14.III.2008, M. Řiha leg. – TANZANIA: 1 ♂, Manyara prov., Mts Hanag, 04°25'S, 35°25'E, 2000 m alt., 12.XII.2017, J. Halada leg. – UGANDA: 1 ♂, Kisoro prov., 10 km E from Kisoro, primeval forest, 01°15'S, 29°47'E, 2277 m alt., 02.II.2016; 1 ♀, Kabale prov., Kashasha, primeval forest, 01°16'S, 29°49'E, 2485 m alt., 03.II.2016, both F. Černý leg. – ZIMBABWE: 1 ♂, Manicaland prov., Chirinda Forest Res., Mt. Selinda, 20°2"S, 32°43'E, 1000 m alt., 02–06.XII.2015, J. Halada leg. First records for Cameroon, Zimbabwe, Tanzania and Uganda.
Subgenus Paraprosopis Popov, 1939
Hylaeus taeniolatus
Förster, 1871: 1068. ♀, Italy: Sicily. Syntypes
Hylaeus (Paraprosopis) taeniolatus
Förster, 1871 –
SIMBABWE: 1 ♀, E Chririnda Forest Land, Mt. Selinda, 26.I.1998, M. Halada leg. This Palaearctic species is distributed mainly in the Mediterranean Region and common there. Probably the specimen is introduced (or mistakenly labelled).
Subgenus Prosopis Fabricius, 1804
Prosopis albonotata
Walker, 1871: 40. ♂♀, Egypt: Cairo; Djibuti: Tadjoura. Lectotype ♂
Hylaeus (Prosopis) albonotatus
(Walker, 1871) –
The species is widespread and usually not rare. It occurs mainly in West Asia and has been frequently collected in Iran, Jordan, Israel and the Arabian Peninsula (Saudi Arabia, UAE, Oman, Yemen). African occurrences are documented from Morocco, Tunisia and Egypt, but also from Central and West Africa (Djibouti [locus typicus], Chad, Niger and Mauritania).
Here it is registered as new to SENEGAL: 26 ♂, 1 ♀, 70 km W Tambacounda, 13°58'N, 14°16'W, 29.VI.2004, M. Halada leg.
(including Hylaeus (Pumilaeus) soukontouai sp. nov., male)
These keys completely replace the previously provided keys of the subgenus Deranchylaeus and their update in
However, the keys have been compiled partly on the basis of a comparatively small amount of material from few localities and may, therefore, not allow for the full range of variability of the species throughout their very large distribution areas.
To optimise the practical applicability of the keys, terminalia characters have been largely omitted. Nevertheless, examination of the terminal structures to validate the identification results is strongly recommended. It is also advisable to refer to the illustrations of the earlier keys, which cannot be reproduced here again. Species characters listed after a long hyphen (—) serve as an additional check on the identification result.
H. soukontouai sp. nov. is tentatively added here, although the species is assigned to a separate subgenus Pumilaeus.
Males
| 1 | Large robust species of 5.0–6.5 mm total length; metasoma compact, broad at base, outline oval; integument strongly and densely punctate; face with white spots | 2 |
| – | Small dainty species with 3.0–5.5 mm total length; metasoma usually elongated and narrow, spindle-shaped in outline; if larger specimens, metasoma finely shagreen and/or face all black | 5 |
• Larger species
| 2 | Face with normal outline, lower part slightly curved; mask yellow or white, clypeus convex; tergum 1 strongly and densely punctate, almost without intervals between punctures; only on margin of terga with fine punctation; sterna flat | 3 |
| – | Face broad and flat, outline converging in a straight line below [70]; mask ivory white; clypeus with shallow longitudinal impression; tergum 1 densely punctate [71], intervals narrow (about 0.5 to 1 puncture diameter), surface finely netted, silky-shiny; sterna 3 and 4 with paired cusps. — Scapes asymmetrically oval, barely expanded, matt | H. (D.) dregei (Strand, 1912) |
| 3 | Scapes apically flattened, the expansion smooth and shiny [92]; integument of tergum 1 smooth, shiny. Small specimens can run in the key to H. curvicarinatus, but differ significantly in the structure of the scapes. | H. (D.) krebsianus (Strand, 1912) |
| – | Scapes not flattened, spindle-shaped, slightly shining; integument of tergum 1 finely sculptured, not smooth | 4 |
| 4 | Integument of tergum 1 shagreen, matt [87]; pronotum slightly extended forward, black | H. (D.) haygoodi Bridwell, 1919 |
| – | Integument of tergum 1 finely striate, shiny [133]; pronotum narrow, with white lines. Small specimens may run to couplet 8 | H. (D.) rugipunctus (Alfken, 1914) |
• Smaller species
| 5 | Face, especially malae, conspicuously long; mesonotum and tergum 1 orange red; claws with widened white arolia (Figs |
Hylaeus (Pumilaeus) soukontouai sp. nov. |
| – | Face with normal proportions, malae narrow; mesonotum and tergum 1 black; arolia narrow, brown | 6 |
| 6 | Tergum 1 with strong, dense punctation; integument often smooth and shiny; when shagreen, then punctation very dense, intervals up to a maximum of one puncture diameter | 7 |
| – | Tergum 1 impunctate or with fine or medium, but scattered punctation on shagreen surface; intervals exceeding one puncture diameter | 13 |
• Tergum 1 strongly punctate
| 7 | Terga 1 and 2 extremely coarsely and densely punctate; surface smooth and very shiny [47]; margins with narrow white, felty bands; scapes small, slender [46] | H. (D.) alfkeni (Friese, 1913) |
| – | Tergum 1 strongly and densely punctate, but punctation much smaller; tergum 2 something finer punctate; surface smooth or finely shagreen; margins usually without distinct bands; scapes slender, cylindrical or conical | 8 |
| 8 | Tergum 1 strongly and contiguously punctate, with virtually no interspaces; punctation of terga margins finer [133]; punctation of tergum 1 and mesonotum similar; face wide, with light yellow mask, supraclypeal area often black [132] | H. (D.) rugipunctus (Alfken, 1914) |
| – | Tergum 1 more scattered punctate, intervals of at least half a puncture diameter [53, 97, 99]; punctation of tergum 1 smaller than on mesonotum; face often prolonged, mask yellow or white, mostly with bright supraclypeal area | 9 |
| 9 | Tergum 1 strongly and very densely, but more finely punctate; intervals smooth and shiny; face round; scapes black; labrum and mandibles dark | 10 |
| – | Tergum 1 very densely, but finer punctate; intervals shagreen and silky-shiny; face trapezoid; scapes and mouth parts often bright | 11 |
| 10 | Frons with projecting white hairs [82]; mask white; paraorbital spots wider above, more or less blunt; posterior margin of mesonotum with white tomentose fringe; tergum 1 apically with white lateral fringes | H. (D.) gessianus Dathe, 2014 |
| – | Frons without projecting white hairs [66]; mask light yellow; paraorbital spots narrow above, often acute; posterior margin of mesonotum without tomentose fringe; tergum 1 apically without distinct lateral fringes | H. (D.) curvicarinatus (Cameron, 1905) |
| 11 | Scapes apically expanded and flattened; labrum, mandibles and scapes black; mask yellowish-white; supraclypeal area narrow, clypeus long [98]; propodeum rounded; punctation of tergum 1 very fine and very dense, the intervals narrow | H. (D.) lightfooti Bridwell, 1919 |
| – | Scapes conical, small, often each with a white stripe; labrum and mandibles pale; supraclypeal area and clypeus of normal proportions [52, 96]; propodeum with sharp lateral edges; punctation of tergum 1 coarser, scattered, with distinctly shagreen intervals | 12 |
| 12 | Mask yellowish-white; scapes with broad white stripe [96]; labrum and mandibles white; mesonotum coarsely punctate; slightly smaller species, 4.5 mm total length | H. (D.) leucolippus (Friese, 1913) |
| – | Mask yellow; scapes black [52]; anterior margin of clypeus, labrum and mandibles light brown; mesonotum more finely punctate; larger species, 5.5 mm total length | H. (D.) bernhardi Dathe, 2014 |
• Tergum 1 finely punctate
| 13 | Mesosoma with coarse punctation (Figs |
14 |
| – | Mesosoma with moderate to strong punctation (Figs |
18 |
| 14 | Mask yellow or orange, supraclypeal area light spotted or black | 15 |
| – | Mask white, supraclypeal area black | 17 |
| 15 | Mask including supraclypeal area and mouth parts often yellow | 16 |
| – | Mask orange, supraclypeal area and mouth parts black (Fig. |
H. (D.) burundis sp. nov. |
| 16 | Antenna long, 4th flagellar segment 1.5× as longer as its diameter; punctation of tergum 1 finer (minute) and more scattered (Fig. |
H. (D.) xanthostoma (Alfken, 1914) |
| – | Antenna shorter, 4th flagellar segment hardly longer than its diameter (1.1×); punctation of tergum 1 more distinct and denser (sparse) (Fig. |
H. (D.) aurantiacus sp. nov. |
| 17 | Lateral edges of pronotum pointed; mesonotum with very coarse punctation (similar to H. aurantiacus, Fig. |
H. (D.) haladanius Dathe, 2015 |
| – | Lateral edges of pronotum only angular; mesonotum with less coarse punctation (Fig. |
H. (D.) sambiensis sp. nov. |
| 18 | Mask light yellow, dull, punctation indistinct (Fig. |
H. (D.) venustus Dathe, 2014 |
| – | Mask white or yellow with distinct punctation; legs and antennae partly or completely black | 19 |
| 19 | Scapes expanded, apically wider than following antennal segments | 20 |
| – | Scapes slender, apically not wider than following antennal segments | 29 |
• Scapes expanded
| 20 | Scapes spherically expanded, shiny [120]; head with unusual form: frons retreating, supraclypeal area very narrow and protruding; face without mask, entirely black as in whole animal, at most with small short pale lines on the orbits | H. (D.) perater Cockerell, 1936 |
| – | Scapes conically expanded, silky-shiny, with fine punctation; mask present | 21 |
| 21 | Mask complete, its upper border transversely truncated below antennal bases; supraclypeal area narrow, its baseline only about half as wide as distance from compound eye; clypeus long (CL:CW 1.7–1.8) | 22 |
| – | Mask reduced, not forming a line above; supraclypeal area and often clypeus black above; baseline of supraclypeal area slightly wider than half distance from compound eye; clypeus mostly shorter (CL:CW 1.6–1.7) | 23 |
| 22 | Mask lemon yellow, upper edge forming a slight bow [128] | H. (D.) robertianus (Cameron, 1906) |
| – | Mask white, upper margin running almost horizontally in a jagged line [110] | H. (D.) oromialis Dathe, 2014 |
| 23 | Paraocular areae completely filled, spots above expanded inwardly, encompassing antennal bases [78]. — Scapes matt apically; propodeal central furrow deeply notched; punctation of tergum 1 very shallow and scattered | H. (D.) gabonicus (Vachal, 1900) |
| – | Paraocular areae either filled or narrow spotted, but spots above not expanded inwardly, usually pointed to orbits | 24 |
| 24 | Mask reduced to bright parts of clypeus and mostly narrow side spots; legs frequently entirely black | 25 |
| – | Mask usually with filling side spots, supraclypeal area may be black; legs with white | 26 |
| 25 | Larger species, about 5.5 mm total length, with characteristic mask [140]; gonoforcipes apically rounded | H. (D.) tinctulus Cockerell, 1932 |
| – | Smaller species, about 5.0 mm total length, mask with white clypeal centre-spot and narrow paraocular stripes at lower areas [54]; gonoforcipes elongate, apically long and narrow | H. (D.) camerunensis Dathe, 2014 |
| 26 | Scapes small, apically only slightly widened [104]; supraclypeal area black or yellowish-white like mask; tergum 1 finely punctate [105] | H. (D.) melanosoma (Cockerell, 1920) |
| – | Scapes larger, more strongly widened; supraclypeal area black, mask white or yellow; punctation on tergum 1 hardly visible | 27 |
| 27 | Scapes bubble-shaped, shiny [116]; distal lobes of sternum 7 prolonged, sometimes visible in anal slit | H. (D.) paulyi Dathe, 2014 |
| – | Scapes conically expanded, matt [62, 74]; distal lobes of sternum 7 short or prolonged, not visible in anal slit | 28 |
| 28 | Proximal lobes of sternum 7 with tooth; mask usually yellow [62] | H. (D.) chimani Dathe, 2014 |
| – | Proximal lobes of sternum 7 without tooth; mask white or pale yellow [74] | H. (D.) eardleyi Dathe, 2014 |
• Scapes not widened
| 29 | Labrum and mandibles dark; scapes black, supraclypeal area often black; genital capsule compact, free part of the gonoforceps no longer than the connected base, partly with narrow styli | 30 |
| – | Labrum, mandibles and supraclypeal area bright; scapes apically usually pale, supraclypeal area never black; genital capsule usually longer, without styli | 31 |
| 30 | Tergum 1 with fine and scattered punctation, intervals 2–3 puncture diameters [137]; end margin of tergum 2 hardly depressed; pronotum black, blade-like anteriorly; gonoforcipes without stylus-like extensions, not protruding from anal slit. — Sternum 7 with 3 slender lamellar bristles, flag long, apical third with 2 spikes (Fig. |
H. (D.) tenuis (Alfken, 1914) |
| – | Tergum 1 a little more strongly and densely punctate, intervals 0.5–1 puncture diameters [59]; end margin of tergum 2 depressed; pronotum with a yellow stripe, anteriorly not lamellate; gonoforcipes with stylus-like extensions, sometimes protruding from anal slit. — Sternum 7 with hooked distal lobes, flag very short, without spikes | H. (D.) capicola (Alfken, 1914) |
| 31 | Mesonotum with moderate dense punctation (Fig. |
H. (D.) diastictus sp. nov. |
| – | Mesonotum with strong sparse punctation (Figs |
32 |
| 32 | Genital capsule in outline elliptical, distal half of gonoforcipes like shell-shaped quadrants, much longer than the compact penis valves; sternum 7 with 4–6 larger evenly spaced lamellar bristles, the flags of distal lobes without spikes; mask light yellow or white, scapes spotted | 33 |
| – | Genital capsule in outline distally tapered, gonoforceps pointed and flattened in distal half, slightly longer than the narrow penis valves; sternum 7 with 4 large lamellar bristles confined to base, the flags of distal lobes are extended into a long bow (lyre shape), apically broadened and with 8–10 spikes; mask light yellow, scapes black with bright tips (Figs |
H. (D.) lyriformis sp. nov. |
| 33 | Mask white to ivory-white; scapes slender conical, black with white apical patch; mesosoma with strong close punctation; tergum 1 shagreen with minute scattered punctation. Sternum 7 with 5 or 6 strong lamellar bristles (Figs |
H. (D.) promontorii Meade-Waldo, 1923 |
| – | Mask pale yellow; scapes stout, wider than half their length, with extensive yellow and/or brown markings; tergum 1 with slightly stronger and denser punctation. Sternum 7 with 4 fine lamellar bristles, the outer one short (Figs |
H. (D.) portokalius sp. nov. |
Females
| 1 | Clypeus convex or flat in front, without impression | 2 |
| – | Clypeus strongly incurved ventrolaterally, with subapical impression usually smooth [44, 45] | 27 |
| 2 | Tergum 1 with distinct, often dense punctation, integument usually smooth and shiny | 3 |
| – | Tergum 1 impunctate or with fine, scattered punctation on shagreen surface | 11 |
• Tergum 1 distinctly punctate
| 3 | Tergum 2 with only slightly finer punctation than tergum 1; integument smooth and shiny | 4 |
| – | Tergum 2 either with clearly finer punctation than tergum 1 or integument not smooth | 6 |
| 4 | Punctation on terga 1 and 2 strikingly large [49]; paraocular area with small white spots on orbits near foveae [48] | H. (D.) alfkeni (Friese, 1913) |
| – | Punctation on terga 1 and 2 significantly smaller [69, 85, 135]; paraocular area with long, narrow white stripes on orbits | 5 |
| 5 | Pronotum and clypeus black; smaller species, total length about 5 mm; punctation on tergum 1 throughout about equal in size, towards middle margin hardly finer [85]; posterior margins of pronotum, mesonotum and terga 1 and 2 with white felt bands | H. (D.) gessianus Dathe, 2014 |
| – | Pronotum with white stripe; clypeus black, occasionally with white apical spot; larger species, total length about 6 mm; punctation on tergum 1 strong, partially decreasing, towards middle of posterior margin moderate [135]; tergum 1 with large white lateral fringes, tergum 2 with interrupted white terminal band | H. (D.) rugipunctus (Alfken, 1914) |
| 6 | Propodeum rounded, medial area at end margin without sharp edge; face black or with stripes; pronotum with bright stripes or black | 7 |
| – | Propodeum with sharp lateral edges, medial area clearly marked; paraocular areae with small white spots above orbits [68]; pronotum black | H. (D.) curvicarinatus (Cameron, 1905) |
| 7 | Face medially bulging, entirely black; terga 1 and 2 finely and very densely punctate, surface shagreen and matt; body entirely black | 8 |
| – | Face medially normal or flat, with pale stripes; terga 1 and 2 with coarser scattered punctation, surfaces shiny; body black or with white marks | 9 |
| 8 | Larger species, 7–8 mm total length; pronotum striped white anteriorly | H. (D.) pamelae Dathe, 2014 |
| – | Smaller species, 5–6 mm total length; pronotum black | H. (D.) perater Cockerell, 1936 |
| 9 | Pronotum black; propodeum with surface of terminal area punctate, shiny [33]; clypeus often with spot. — Paraocular areae with white stripe on orbits [94] | H. (D.) krebsianus (Strand, 1912) |
| – | Pronotum with white or yellow stripe; propodeum with surface of terminal areae finely shagreen, matt, at most lateral areae punctate; clypeus black or with yellow stripe | 10 |
| 10 | Pronotum with white line(s); face with three yellow stripes: on paraocular area adjacent to orbits and in middle of clypeus [64]; mesonotum sparsely punctate, shiny | H. (D.) claviger (Cockerell, 1936) |
| – | Pronotum with yellowish line; face with two sometimes abridged stripes on lower facial area at orbits [108]; clypeus black; mesonotum densely punctate, matt | H. (D.) nottoni Dathe, 2014 |
• Tergum 1 finely punctate
| 11 | Lower part of face yellowish-red, at least parts of clypeus, but usually also mandibles, labrum, malae and lower orbits (Figs |
12 |
| – | Face with white or light-yellow marks or completely black | 17 |
| 12 | Head and clypeus strikingly long (Fig. |
H. (D.) aurantiacus sp. nov. |
| – | Head and clypeus shorter (Figs |
13 |
| 13 | Mesonotum finely punctate (Figs |
14 |
| – | Mesonotum coarsely punctate (Figs |
15 |
| 14 |
Scapes and legs yellow; mesonotum with fine dense punctation (Figs |
H. (D.) venustus Dathe, 2014 |
| – |
Scapes and legs entirely or predominantly black; mesonotum with moderate close punctation (Figs |
H. (D.) jemeniticus sp. nov. |
| 15 |
Scapes and legs black; mesonotum with dense moderate to strong punctation (Fig. |
H. (D.) promontorii Meade-Waldo, 1923 |
| – |
Scapes and legs predominantly or entirely orange; punctation of mesonotum coarser or shallower (Figs |
16 |
| 16 | Mesonotum with stronger punctation, intervals about 1 puncture diameter (Fig. |
H. (D.) xanthostoma (Alfken, 1914) |
| – | Mesonotum with finer punctation (Fig. |
H. (D.) portokalius sp. nov. |
| 17 | Face with three lemon-yellow lines along orbits and on clypeus, with yellow stripe on pronotum and spots on calli and tegulae; punctation of mesonotum large and dense, but shallow [35] | H. (D.) capicola (Alfken, 1914) |
| – | Face with only small bright spots, short or narrow stripes or all black; punctation of mesonotum deeper | 18 |
| 18 | Mesosoma conspicuously coarsely punctate; pronotum distinctly widened, anterior edge sharp, corners pointed [ |
H. (D.) haladanius Dathe, 2015 |
| – | Mesosoma normally punctate; pronotum slightly widened, anterior margin and corners edged; face with bright stripes or flecks | 19 |
| 19 | Propodeum terminal area circumscribed by a carina, especially with distinct oblique edge between lateral and terminal areae [3] | H. (D.) tenuis (Alfken, 1914) |
| – | Propodeum terminal area sharply edged only ventrolaterally, lateral areae posteriorly without edge | 20 |
| 20 | Clypeus vaguely punctate; with shallow punctation, which especially apically seems to decrease below and fade into sculpture [38, 39] | 21 |
| – | Clypeus more clearly punctate, with defined punctation, clearly separated from sculpture over whole surface | 22 |
| 21 | Mesopleura below scrobal groove with angulate front margin; pronotum at sides edged, not bevelled down; face black [56] | H. (D.) camerunensis Dathe, 2014 |
| – | Mesopleura with front margins only edged; pronotum sloping down laterally; face with narrow white paraocular stripes [118] | H. (D.) paulyi Dathe, 2014 |
| 22 | Clypeus shagreen and shallowly punctate; face usually black, rarely with small yellowish-white spots or dashed lines | 23 |
| – | Clypeus with fine, but clearly demarcated punctation; face often with paraocular stripes | 24 |
| 23 | Clypeus in front slightly widened and bent up [40]; supraclypeal area narrowed above [142], frons adjacent to frontal line punctate | H. (D.) tinctulus Cockerell, 1932 |
| – | Clypeus in front widened, but not bent up [41]; supraclypeal area wider above [106], frons adjacent to frontal line striated | H. (D.) melanosoma (Cockerell, 1920) |
| 24 | Lateral extensions of pronotum horizontal, projecting at a right angle | 25 |
| – | Lateral extensions of pronotum sloping, sides inclined downwards | H. (D.) oromialis Dathe, 2014 |
| 25 | Clypeus laterally convex, densely and strong punctate; paraocular stripes narrow, but can be widened inwards [80]; clypeus sometimes with spot on front edge | H. (D.) gabonicus (Vachal, 1900) |
| – | Clypeus flat, punctation finely dispersed in predominant shagreen; paraocular stripes reduced to small patches [76, 130] | 26 |
| 26 | Sides of pronotum nearly right-angled [42]; clypeus apically without smooth margin; median furrow of supraclypeal area only distinct in upper part of edged bulge | H. (D.) eardleyi Dathe, 2014 |
| – | Sides of pronotum obtuse angled [43]; clypeus apically with narrow smooth margin; median furrow of supraclypeal area reaching into front region of bulge | H. (D.) robertianus (Cameron, 1906) |
• Clypeus with impression
| 27 | Impression of clypeus widened upwards, not definitely limited above; larger species; face markings different; pronotum with white lines or black | 28 |
| – | Impression of clypeus transversely oval, limited above; smaller species; paraocular area with mostly short white stripes at orbits; pronotum black | 30 |
| 28 | Impression of clypeus shagreen and punctate, lacklustre, without tubercle in middle; large completely black species | H. (D.) amharicus Dathe, 2014 |
| – | Impression of clypeus finely shagreen, impunctate, shiny, with tubercle in the middle; smaller species with at least tegulae and paraocular spots pale | 29 |
| 29 | Paraocular area with long white stripes at orbits; pronotum with interrupted white line. Outline of head circular; tergum 1 moderately punctate, intervals shagreen, silky-shiny [73] | H. (D.) dregei (Strand, 1912) |
| – | Paraocular area with short white comma-shaped spots at orbits above; pronotum black; head outline trapezoidal; tergum 1 more strongly punctate, intervals smooth and shiny [91] | H. (D.) izikosalis Dathe, 2014 |
| 30 | Tergum 2 with distinct punctation near posterior margin, integument smooth and shiny; paraocular spots prolonged, almost to middle of clypeus [102] | H. (D.) lineaticeps (Friese, 1913) |
| – | Posterior third of tergum 2 impunctate or punctation disappear more or less in shagreen sculpture; paraocular spots usually only short and comma-shaped [88, 100] | 31 |
| 31 | Larger, more robust species of 6–7 mm total length; punctation of tergum 1 coarse and contiguous, integument matt; clypeus not subtuberculate above impression [44, 88] | H. (D.) haygoodi Bridwell, 1919 |
| – | Smaller species of less than 6 mm total length; punctation of tergum 1 strong, but not coarse, integument silky-shiny; clypeus medially subtuberculate above impression [45, 100] | H. (D.) lightfooti Bridwell, 1919 |
The genus Hylaeus is represented in sub-Saharan Africa by 79 known species, which are assigned to six subgenera. Smaller subgenera are Cornylaeus Snelling, 1985 with three species, Alfkenylaeus Snelling, 1985 with six species, Metylaeus Bridwell, 1919 with five species and Pumilaeus Dathe, 2015 with two species (
The subfamily Hylaeinae in Africa is completed by a special monotypic genus, Calloprosopis magnifica (Cockerell, 1942), which is only documented from higher altitudes in Kenya (
Taking them all together, including the Malagasy species, we currently know 80 species of Hylaeinae in the whole area. This is a comparatively small number compared to the well-studied faunas of Europe with 83 species, Central Asia with 70 species (Dathe and Proshchalykin 2018) or Asia Minor with 86 species (Özbek and Dathe 2020). Obviously, our knowledge of the African bee fauna as a whole is comparatively limited. In this respect, we should not be surprised that even a few more or less haphazardly collected specimens can alter the picture significantly. In my opinion, the cited reviews provide us with a framework that enables a reliable orientation within which further research can and should take place. The real richness of the African fauna will only become apparent on closer inspection, i.e. in systematic studies over large areas and periods of time. According to the consensus opinion of experts, Hylaeus species are not frequently encountered in the field in sub-Saharan Africa. It may be necessary to search for them specifically and success will greatly depend on acquiring an understanding of the ecological relationships between the bees, their forage plants and habitats, as well as their phenology.
An interesting lead on connections between sub-Saharan African and Southwest Asian faunas could be found still in another place. A new species from Cameroon, H. soukontouai sp. nov., represents presumably a second species of the recently-described subgenus Pumilaeus Dathe, 2015. The other described species in this subgenus, H. (Pumilaeus) pumilus Dathe, 2015, also originates from Cameroon. Here, morphological similarities were found to an isolated species from Oman, which I had recently described as H. (Paraprosopis) samhanicus Dathe, 2022. As the example of the newly-discovered H. soukontouai in Cameroon shows, every single observation can still provide valuable clues – and raise new and unexpected questions.
I would like to thank Andreas W. Ebmer, Martin Schwarz and Esther Ockermüller (Linz, Austria) for their support over many years. They also provided me with new material from the stocks of the Biology Centre Linz. Connal Eardley (Pretoria, South Africa), Michael Kuhlmann (Kiel, Germany) and Alain Pauly (currently Arusha, Tanzania) have been again my main advisors on the African fauna. Many thanks to them as well. Andrew Liston (