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thanks.

and what about this? http://home.hccnet.nl/mp.van.veen/conopidae/myopa.html#intro :D

Tergite 4 and 5 with silvergrey dusting, at the front border with two large, dark rectangular spots without dust, these spots well separated; face: at the mouth edge left and right a thin black stripe. 6-8 mm. -> Myopa variegata Meigen