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Dear Piet, thank you for your reply. It is very interesting. I wish that your new sets of characters will turn to be satisfactory and replaced the unsatisfactory ones presently offered. In this case the new key for Sciomyza should be published as soon as possible. (I can add that it seems to me that “yellow” specimens are usually substantially bigger than “black” ones.)
In my turn, if you put on Diptera.info (or send by e-mail) your project of key for Sciomyza I’ll check our ZMUM material and report you how the new key works.
So far, I still suspect that testacea, dryomyzina, sebezhica and pulchra are the same variable species…
Nikita