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Photographed by Tom Murray, Location is USA, Massachusetts.

https://www.inatu.../218433468

This fly looks like typical Coenosia tigrina, but it only has one median bristle on each hind tibia instead of the normal approximated pair. I don't see sockets for the missing setae. Genitalia looks the same, more or less, as C. tigrina as well.

Is this variation known in C. tigrina?