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Hi.

I have to disagree! Coenosia should have three postsutural dc setae (+ one presutural); your photo clearly shows 1+4 dc. Coenia palustris is a very common species and I have plenty of reference material in my own collection. The habitus is very close, but C. palustris has brown dusting on thorax & a darkened haltere.

Hmm hmm feels weird going against the word of a well-known group specialist. I've met her a few years ago in Helsinki and she kindly checked some of my own specimens, including some C. palustris.