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S. elegans has yellow humeri. S. clunipes does not... However colour in Sphegina is not always as it 'should' be. I have S. elegans in collection which have dark humeri. The other difference is that S. elegans has a very long and thin second abdominal segment. The segment here is sshorter and thicker. That would make it S. clunipes.

Greetings,

Ectemnius