Photos of Helianthus grosseserratus and aggregatory Nomada asteris Swenk, 1913. A. Five males aggregating on a single flower; B. Two males on petals of flower; C. Male N. asteris resting on flower petal; D. Female on flower petal; E. Patch of H. grosseserratus where observations were made.

  
 
  Part of: Herbison ND, Zabinski WJ (2026) A cuckoo slumber party? Rediscovery of Nomada (Pachynomada) asteris Swenk, 1913 (Hymenoptera: Apidae), with notes on unusual male aggregatory behavior. Contributions to Entomology 76(1): 105-114. https://doi.org/10.3897/contrib.entomol.76.e184930