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I don’t have a good photo of the area just posterior to the anterior thoracic spiracle but I suspect that those bristles might be visible in a dorsal view. If they would be, I don’t see them.

Assuming that there are no bristles there, this appears to key out to Lonchaea using both the Manual of the Nearctic Diptera and the Lonchaeidae Online keys: setulae on lunule, one bristle on katepisternum (as seen in ventral photo), aristae bare. I’ve included a poor photo showing the fully extended ovipositor in case it’s useful.

I’d really appreciate input from those with more expertise than me. TIA











Edit: fixed the link to the lousy ovipositor photo