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I like how this fly is hugely robust on the thorax and then has a thin little abdomen. Scathophagidae, right? Can anyone shed any light on ID to genus?

West Virginia USA, 26 May 2007, alongside a very small woodland stream. Length about 6.4 mm.

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Here is a frontal view of this fly.

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Lauxaniidae... Sapromyza sp. ? (it is a test, as Nikita used to says) :D

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And just to make it interesting, is this one same family? It is a different individual. What huge eyes (so, a male?)

This one has an even smaller abdomen that doesn't seem to match the huge thorax.

Same location as the first fly, a couple of days earlier, size just a little smaller.

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Here is a look at the front of fly #2.

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different sexes. one female and the other is male. :D let?s go wait for real experts. :D

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I think it is Anthomyiidae, genus Pegomya. It looks very much alike our Pegomya testacea, which is only Palearctic species.
Nikita

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in the first case, anal vein doesn?t reach wing margin. is it one of exceptions among Anthomyiidae? :)

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Thank-you Jorge, Nikita! Time for me to go and look at some pictures.

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I'd cancel my compare with P. testacea, but I still think it is some Pegomya of Anthomyiidae.
Jorge: the fact that it seems by photo that doesn't mean that it doesn't reach it really, it is bad visible character for photo...