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I have found labral blade at last. It is flat a little narrower than eye, about 3,5 times as long as wide, apex with incision separating oval darker lobe with a group of setae and some small teeth (possibly 2, one of them is larger) at apex. Preapical part has a group of setae too. I am away from the stereomicroscope now and can/' t make photo till Monday.