6. Frequency distribution of the growth constant k among Erebia species. Three clusters can be distinguished which contain species with 4 (light grey), 5 (dark grey) or 6 (black) larval instars. An additional cluster comprises species with 4 or 5 instars (hatched grey). 7. Detailed presentation as a bar diagram of the cluster from Fig. 6 comprising 12 species with 4 or 5 instars. Samples are arranged by increasing values of the growth constant k. Dark grey bars: species with 5 instars. Light grey bars: species with 4 instars.