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Well, my knowledge of Palaearctic therevids is pretty slim (having concentrated mostly on New World taxa - and you are right, it does look a little like Ozodiceromyia nanella :)), but the coloration/vittae certainly fits that of some Thereva. Also, the shiny black upper frons is typical for Thereva, although it occurs in other genera as well. You best bet is certainly to contact Kevin Holston (kevin.holston@nrm.se) - he will know for sure as he is very familiar with the Palaearctic Thereva.