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Massachusetts, USA in June in deciduous woods. It was having wing difficulty and couldn't fly away from me immediately. I think this is Anthomyiidae based on the strong anal vein, but the wing margin is torn and I can't say where the vein would end if the wing were intact.



I have more and larger pictures at http://www.flickr...41/detail/

Similar flies (Muscidae and Anthomyiidae both, I think) are common on leaves beside trails in these woods in summer.