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Thanks, but then it puzzles me that in Mikes Insect Keys, M. propleuralis keys seperately from M pusilla. I concluded against propleuralis because of the shorter wings (3,5 instead of the 5mm of propleuralis) and the lateral dark longitudinal stripe on thorax bend down, but do not reach the dark flecks on and above the notopleuron, as they should do in M. propleuralis.
Could M nana be a synonym for M pusilla? M nana does not appear in Mikes keys.