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Thanks Chris,
I compared the face of Lypha dubia on the " Dimitry Gavrushin 2007 photo No 13801 " in "Tachinid Recording Scheme" of UK tachinids and I have found the differences mainly
as for the character of bristle rows between the frontal stripe and eye: as you can see
on my photo (I enclose it once more) there are 3-(4) rows of tiny black "spots" downwards.
Furthermore the 3rd segment of antennae is dissimilar. Well, I am taken aback...
The problem, however, must go on! Thanks once more Petr