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Genus Bibio

Fly 009 - Bibio Robber fly? - Bibio femoratus March Fly - Bibio albipennis - male Bibio femoratus - male - female Unknown Diptera - Bibio albipennis UnIdentified Sawfly? - Bibio - female Mating pair - Bibio articulatus - male - female March Fly - Bibio - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Nematocera" (Non-Brachycera))
Infraorder Bibionomorpha (Gnats, Gall Midges, and March Flies)
Family Bibionidae (March Flies)
Genus Bibio
Numbers
32 spp. in our area, ~200 spp. total(1)
Identification
The distinctive generic character of adults is the long, thick spurs on the front tibiae. Larvae have two openings in the posterior spiracle, compared to one in Penthetria and three in Dilophus. Wing venation has Rs (or R5) unforked, shared with Dilophus and distinct from the other genera in the family.
Wing venation (note that R-M is shorter in the illustration than is typical of the genus):

Posterior spiracle:
Range
Worldwide, but mostly holarctic (about half of the spp. are Palaearctic), poorly represented in warmer climes(1)
Print References
Hardy D.E. (1945) Revision of Nearctic Bibionidae Including Neotropical Plecia and Penthetria (Diptera). University of Kansas Science Bulletin, 30: 367-547. (Full Text)
Fitzgerald S.J. (1996) Notes on Nearctic Bibio (Diptera: Bibionidae). Proceedings of the Entomological Society of Washington, 98(1): 50-54 (Full Text)
Fitzgerald S.J. (1997) Additional Notes on Nearctic Bibio Geoffroy (Diptera: Bibionidae). Proceedings of the Entomological Society of Washington, 99(2): 294-304 (Full Text)
Works Cited
1.Evolution and classification of Bibionidae (Diptera: Bibionomorpha)
S.J. Fitzgerald. 2005. Ph.D. Thesis, Oregon State University. 385 pp.