---

As for your second question, Frank.
In Sciomyzidae key for Europe part of Russia, both Euthycera and Trypetoptera called "common".
My short (one year) experience in Diptera tell me so far "not at all as common or I don't know right places to search".
In fact during last summer I have seen Euthycera only once, and only once I have seen Trypetoptera collected by my friend and this site member Dima (Black). And this two imeges (Black's and mine) was the only images of Euthycera and Trypetoptera which ever appeared on this site from Europe (one more Euthycera from US was photographed by Stephen as far as I remember).
Nikita