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Dear collegue "Sundew", thanks you very much for your answer and correcting the links and the cyrillic/latin words.

In the work of Matile & B-B is not a key but the authors looked at the "types" and they wrote they find those differences, and, because of that it would seem that they are more or less constant.... but not.... so they gave that clue only after looking a few specimens?? Is something strange I don't know... They also write at the end you have to look at genitalia.

In my opinion there is one small error in that work: the genitalia is draw dorsally and not ventrally

The feature/characteristic rate of legs has a large amount of variation, but the wingveins rate could work better (if you look at the rate as over/below 1), but I have just checked one testaceus picture.

And yes, I sent an image of the pdf key to an ocr online converter and ticked the russian language for all the text...

Do you think that the characteristic of the gonostylus shape is correct? because somewhere you wrote about the ventral appendix of the gonocoxite and that projection is pointing dorsally...

This is what I meant with triangular with concave sides:
https://www.dropb...E.png?dl=0

So thany you very much for your comments, all the best,
Rafael