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This piece is exhibited at the Royal Belgian Institute of Natural Sciences, in Brussels. It comes from Colorado, but no data about age or formation. Size is like an extant Eupeodes. I need help with the name, please! Thanks!

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Most Colorado insect fossils are from the Florissant formation and the Eocene.

I can't help with the ID.

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Thanks John, less is nothing! (sorry the system didn't notified me about new replies in this post, for that my delay in replying).
Looks like very familiar, extant-genus like... much like an Eupeodes or something similar?