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According with key 'The Tachinids of Central Europe' Hans-Peter Tschorsnig and Benno Herting (if I didn't make a mistake) this is some species from Wagnerini or Ligeria angusticornis - depending of bristles on r4+5 what isn't visible on these photos. Kirbya and Wagneria don't have rounded deflection of m, so I incline Ligeria. I didn't find this species in neither gallery nor forum but I found here http://tachinidae...brcno=4301 Can somebody confirm this id?
06.06.2009, northern Poland, size ~5 mm