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Valerio, that language problem note is probably related to me, not to you :)

It is pretty correct, however, the main problem of amateurs with such keys is that it is quite difficult to understand quantifications such "narrow" or "extensive". I lack practical experience and thus, I can misunderstand descriptions.

As for ID, the prominent Slovak dipterologist Vladimir Straka now identified my picture (not the one sent to this forum, but almost surely the same species) as Villa circumdata, which, as far as I can understand, means V. faciata, because the Villa longicornis has hyaline wings. Am I right?