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Thistle Gall Flies

Yet another species of picture-winged fly, this time on thistles (Cirsium sp): probably Xyphosia miliaria (Diptera: Tephritidae).  Similar to the Terellia tussilaginis that I saw on burdock last year, but the wings don't have the faint yellow bands.

The flies in these three images appear to all be males.

Photos taken in Whiteknights Park, Reading University grounds, Reading, UK, on 2010-06-23.

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