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with Gregor. F et all (2002) Muscidae of Central Europe I have arrived at Hydrotaea cyrtoneurina as halters black, wings clear, eyes densely haired, mid tibia no AD, parafacial widt about same as width flagellomere, hind femur no ventral spine, and chaetotoxy on hind tibia and mid tibia as described for H. cyrtoneurina ...unless there is a related Hydrotaea species for this part of Europe which not occurs in Central Europe and which also fits the description.
Is my conclusion correct??

see image hind leg