On research and entomological education III: Firefly brachyptery and wing "polymorphism" at Pitkin Marsh and watery retreats near summer camps (Coleoptera : Lampyridae; Pyropyga)

The origin, evolutionary malleability, and sometimes loss of insect wings, gossamer structures whose existence has reshaped the natural world, is one of the moat interesting and enigmatic dramas of insect biology. Lampyridae have long been known for the reduced wings that occur in females of some ge nera, but in all previously known examples it is a fait accompli, with litt le or no intraspecific variation. Such variation occurs in and among popula tions of the little daytime firefly Pyropyga nigricans, and also, among the se populations there appears to be variation in sexual involvement in the p henomenon, with brachypterous males also occurring at some localities. This firefly provides an opportunity for students, both in summer classes and a s solitary individuals, to study the evolutionary biology of wings, from ad aptive significance to sexual selection and population ecology and genetics , to speciation, and in a variety of habitats from strands on northern glac ier lakes to southwestern montane stream sides and beyond, to west-coast ma rshes.