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I found this fly dead indoors on 21 April 2014. I measures about 6mm long. I've been through the Belshaw key numerous times but still I'm not sure. At the moment my best guess is Macquartia tenebricosa but I'm not sure that the lower calypter is close enough to the scutellum, and the flight period isn't quite right. My second choice would be grisea, but this specimen seems too shiny black for that species even though the flight period is right. I have the specimen if more images or an expert examination is needed.
Best wishes,
Martin