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A typical postabdomen for Heleomyza ! as could be shown by Gorodkov, 1962. Other characters: two egually orbital bristles , genal setulae well developed ect... Unfortunately the prosternum is not visible (should be more than 2 pairs of setulae present). The species could be H. serrata or H. captiosa (rather serrata causing rounded epandrium). If am wrong a glass of vine will be wait for you !
(of course in Poland !).

of course should be wine not the latin name. In vino veritas ! :D