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You've found it Crex!
Last year I ID eggs on my photo as Tabanidae exactly because of this photo. Now I regard the problem as not as easy.
1. Russian description under this photo is "eggs of Slepen'". Russian words Slepen' means both Hybomytra and Tabanus genuses.
2. Sait and photo belongs to our member Victor Shilenkov, he is good entomologist and expert in Carabidae, but not expert in Diptera.
So we badly need Theo's oppinion!