Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington


Genus Bibio

Huge March Fly (Bibio albipennis) - Bibio albipennis - male Fly - Bibio albipennis - male Larvae of??? - Bibio Unsure - Bibio - male Probably Bibio xanthopus or B. fraternus - Bibio - male kelp fly ? - Bibio albipennis Fly on Currant - Bibio - male Flying insects swarming by stream - id requested - Bibio
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
32 spp. in our area, ~200 spp. total(1)
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:
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.