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For Insects, Spiders & Their Kin
For the United States & Canada
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Genus Bibio

Long fly - Bibio albipennis - male March fly - Bibio lanigerus - male Bibio femoratus ? - Bibio femoratus Hymenoptera? - Bibio articulatus - female Fly - Bibio femoratus - male Bibio xanthopus - male Orange and Black March Fly - Dorsal - Bibio superfluus - female BIbio - Bibio albipennis - female
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
Explanation of Names
Bibio Geoffroy 1762
32 spp. in our area, ~200 total(1)
Long, thick spurs on adult protibiae distinctive. 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:

see (2)
Worldwide, but mostly holarctic (about half of the spp. are Palaearctic), poorly represented in warmer climes(1)
Print References
Works Cited
1.Evolution and classification of Bibionidae (Diptera: Bibionomorpha)
Fitzgerald S.J. 2005. Ph.D. Thesis, Oregon State U. 385 pp.
2.Revision of Nearctic Bibionidae including Neotropical Plecia and Penthetria (Diptera)
Hardy D.E. 1945. University of Kansas Science Bulletin 30(15): 367-555.
3.Notes on Nearctic Bibio (Diptera: Bibionidae)
Fitzgerald S.J. 1996. Proc. Ent Soc. Wash. 98: 50-54.
4.Additional Notes on Nearctic Bibio Geoffroy (Diptera: Bibionidae)
Fitzgerald S.J. 1997. Proc. Ent Soc. Wash. 99: 294-304.