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Tephritid Fly

A male Tephritid fly, probably Chaetostomella cylindrica (Diptera: Tephritidae), on knapweed (Centaurea sp). 

Note the everted pheromone sac on the side of the abdomen.  The males use these to attract females.

Photos taken Whiteknights Park, Reading, UK, on 2012-07-28.

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