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I think this is Anthomyia oculifera but there are other genera of Muscoidea that look identical to Anthomyia to me. Oculifera is the only local species of Anthomyia with a continuous black band on the male thorax.

Massachusetts, USA September 4, 2011.


(Click for large or view on Flickr.)

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It's certainly anthomyiid (anal vein, small calypters), and apart from the extent of the black bits looks very like our Anthomyias.