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Ok a lot of features fits Phytomyza gymnostoma, but some not: sutellum coloration, top of head coloration, the body size - this one at least 1 mm smaller, ....

mybe this is male, but speculating. Time of year & place of find is the same for both images on link, the upper is Phytomyza gymnostoma female:http://agrozoo.ne...806120.jpg