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This is probably Alliopsis fractiseta Stein or albipennis Ringdahl female. These two species form the fractiseta species group of Alliopsis. I am just a bit puzzled by the number of setae on the legs. It''s possible that there are other species of Nearctic Alliopsis that I don't know which look like this.

Judging by the comments about Anthomyiidae, are you all suggesting that this family is more difficult than Agromyzidae, Phoridae, Chironomidae etc?