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Well, I think it's Muscidae, but frankly I cannot be sure it's not a calliphorid or a tachinid (though it doesn't look like a dexiine which are usually the only tachinids with plumose antennae. The very large eyes and the gently curving vein M both suggest Muscidae, but I can't key it out to any genus on the visible characters. Nearest I get is Muscina, but have my doubts. No doubt it will be recognised by someone on your side of the Atlantic - over to Bugguide! :)