Review of the Dasyhelea fasciigera species group (Diptera: Ceratopogonidae) with a revision of the Nearctic species

Abstract

The Dasyhelea fasciigera species group is characterized by males having a gonostylus divided nearly to its base. Five species are present in the Nearctic region: D. tristyla Wirth, D. bifida Zilahi-Sebess, D. fasciigera Kieffer, D. crassiseta n. sp., and D. pollex n. sp. Each species is described and its distribution discussed; a key for the identification of the males of the Nearctic species is provided. A lectotype is designated for D. dentiforceps Tokunaga, from Japan.