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I think Synthesiomyia is often overlooking by Muscid collector, including me, due to this resemblance.
More common on carrion or excrements Sarcophaga seems testy enough either for Mantis or Asilid, so there is no reason to mimick it for Synthesiomyia. Synthesiomyia is oviparous, Sarcophaga larviparous.
So, the only idea: such a colour pattern should be profitable for visitor of carrion. But what the hell profit to be striped on carroin???