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Well, I'll try to say my opinion:

This is
NOT Trichocera annulata - abdomen has no visible dark bands
NOT T. saltator - ovipositor is too short for saltator
NOT T.regelationis - I don't see dark spot on r-m vein and distal tarsomeres are too long for regelationis

So T.hiemalis is what's left from your list, although I'm not absolutely sure about it too... This could well be something else :)

Andrius