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I am far from being an Asilidae expert, but darkened wings and pronounced antennal hump are said to be typical for D. flavipennis (e.g. http://www.dipter...d_id=61953). The key http://www.geller...octria.htm allows for blackish coxae. And in http://www.robber...iofla.html it is stated that there are 2 different species mixed under the name D. flavipennis - it might be the second one with the antennal hump not reaching the upper eye margin...