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Hm...I've looked through and old russian-languaged key and now think it maybe Systoechus laevifrons (couldn't find any information on internet about the species), and here's the translation of description:

"Face and forehead covered with dense black hair (without bright ones)..."B)

And there are also the drawings of female and male. (see attached file). The problem is I don't know whether the species is valid or not.