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TaxonomyBrowse
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Genus Bibio

March Fly - Bibio vestitus - female Bibio albipennis - female Bibio sp. - Bibio superfluus - female March fly - Bibio xanthopus - male March fly - Bibio - female Flush-eyed fly - Bibio - male Help ID this Fly - Bibio articulatus - male Fly at porchlight - 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
Synonyms and other taxonomic changes
Bibio Geoffroy, 1762
Explanation of Names
Late Latin bibio, an insect (1); "A small insect generated in wine" - from Latin bibō, drink Wiktionary
Numbers
32 spp. in our area, ~200 spp. total(2)
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(2)
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.Dictionary of Word Roots and Combining Forms
Donald J. Borror. 1960. Mayfield Publishing Company.
2.Evolution and classification of Bibionidae (Diptera: Bibionomorpha)
S.J. Fitzgerald. 2005. Ph.D. Thesis, Oregon State University. 385 pp.