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Thank you Dima.
Sepedon always has elongated 2-nd antennal segment, so it isn't Sepedon.
In web there is one image of Sepedomerus. If photo ID is correct it isn't Sepedomerus.
More probable candidate - Hedria mixta.
There is one image in:
http://www.entomology.umn.edu/museum/links/Interactive%20Key%20Gallery/source/sciomyzid(hedria).htm

I'm sure Stephen will check it using US sources.
Nikta