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So, Gerard solved the mystery already.
It is indeed a male of the family Sarcophagidae, subfamily Sarcophaginae. If it is from USA, then it is unlikely to be Sarcophaga ss., because this genus is predominantly Palaeartic.
So one can use the key to genera in Manual of Nearctic Diptera.
However, in many cases the male genitalia are of importance, so identification may prove troublesome.


Theo Zeegers