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I explain my point of view :
I don't think it's Polietes simply because they have 3+3 ac, here I see only 2+3 ac, and 3+4 dc, here I see 2+4 dc. I think the M-Cu is not enough oblique, the eyes not enough close, and the pattern well too symmetrical.
I think Phaonia trimaculata can have 3 post ac (2 rather strong, and a weaker between) like on this thread : http://www.dipter...ad_id=3353
The description with Phaonia trimaculata is well fitting (eyes densely long haired for the male are OK) and the pattern on the scutum / scutellum is quite typical.