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I agree with Jorge about C. flavipes; try this key for Conopidae (go to Conops there):
http://home.hccne...index.html,
Thanks to Mark van Veen! :)

IMO, flying Conopidae demonstrate the most impressive mimicry! :o
I think it's a very effective trick to approach the host (Conopidae are parasitic flies, females infect hymenopterans in the air...). Am I wrong?