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Species Bibio vestitus

March Fly - Bibio vestitus - female March Fly - Bibio vestitus - female Bibionidae - Bibio vestitus - male Sawfly ? - Bibio vestitus - female Fly - Bibio vestitus - male Mating flies - Bibio vestitus Bibio nematoceran flies, possibly Bibio femoratus but doesn't quite fit - Bibio vestitus - female March fly - Bibio vestitus - male
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
Species vestitus (Bibio vestitus)
Synonyms and other taxonomic changes
Bibio vestitus Walker, 1848
Bibio nervosus Loew 1864
Bibio basalis Loew
Bibio mickeli Hardy, 1937
"Bibio vestitus is a boreomontane species occurring at far northern latitudes and usually in montane regions at more southern latitudes. The flight period of Arizona populations is June, which corresponds to the June through July flight period of populations elsewhere."(1)
Leg color can vary from black to almost entirely red. Males normally have dark femora, females red femora.
Mostly red-legged females are similar to B. xanthopus, which usually has shorter spurs and always(?) has more antenna segments. See discussion here:

Females with only femora red can be confused with B. femoratus, which has all coxae and trochanters black (red in vestitus).
Works Cited
1.A Revision of Bibio (Diptera: Bibionidae) of Mexico and Central America
Scott J. Fitzgerald. 1997. Transactions of the American Entomological Society.