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Hello Stephane, I've sent a pm to you.

Meantime, I conclude that this species must be Fannia pallitibia. I admit that the pdf keys that I have are for males only. This is a female. But I think that the only similar species (with yellow tibiae) is Fannia pruinosa. From what I understand, F. pruinosa has setose parafacials. If so, then I do not see hairs on the parafacials. Further, the thorax and abdomen look black with gray dusting but not what I would describe to be pruinose.

I admit that I struggle dissecting ovipositors. My tools are too large. The only only scissors smaller than my micro scissors cost 400 euro in Germany. I don't care to import from North America, so I suppose I will have to visit a CNC shop for a custom design. :)

I will post the ovipositor here with a few photos illustrating the aforementioned features. If you can confirm Fannia pallitibia, then I will add photos to the gallery.