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The Peacock Fly, Callopistromyia annulipes, is a small picture-winged fly (family Ulidiidae). It gets its common name from the peculiar way in which both males and females strut around, usually on rotting trees or logs, with their wings raised up and pointed forward, resembling a peacock's tail (Banks 1903, Steyskal 1979). This species is native to the United States and Canada (Steyskal 1979, Kameneva & Korneyev 2006), but it has recently turned up in Central Europe and appears to be spreading across the continent (Merz 2008, Merz & Van Gyseghem 2008, Smit & Hamers 2011, Korneyev et al. 2014).