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I had fun photographing these flies. Repeatedly, one fly would encounter another and they would fly round and around each other like in a whirlwind.

The first image shows the antennae with what looks to me like a bare arista, which made me think of Tachinidae.

The second image includes the bristly rear of the fly which looks right for Tachinidae.

That large white area near the base of the wing, is that the "well-developed post-scutellum"? I first thought maybe it was a calypter, but it appears to be below the wing.

Data: meadow not far from woods, stream, and wetland. West Virginia, USA. Date was 16 July 2006. Size about 4.75 mm.