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I am not very familiar with the Nearctic diptera but with such a wide vertex it would normally be either Miltogramma (Sarcophagidae) or Gonia (Tachinidae)... but to be sure you really do need to check for the presence/absence of a subscutellum. Just on the 'look' of it I would tend to agree with Nikita that it looks like Miltogramma, but it looks very bristly and I'd like to see it under a microscope to make sure :)