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hi, this is my first post here so I should say hello to everybody!

to the syrphid in question I do not have an answer to its specific identity but would like to add that the large, rectangular dark spots on the sternites should exclude E. latifasciatus? and I think that I see two distinct dust spots on the frons in the last picture, which latifasciatus obviously doesn't have.

The sternite pattern is typical for E. nitens, but female E. nitens would have femur 3 entirely yellow and a much darker tergite 5, isn't that right?

Could this be E. bucculatus?