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Photo#268036
Bibionidae--wing venation - Bibio

Bibionidae--wing venation - Bibio
Wing venation of Bibio species, typical of family Bibionidae. Note the large anal region.
From Comstock, Introduction to Entomology, which has various editions from the 1890's to the 1930's, apparently now in the public domain. (Modified from a scan at Biodiversity Heritage Library.)

Thank you...
...for posting this extremely useful diagram. I'm sure it will be an excellent reference tool for many contributors seeking an ID.

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