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Hi, Stephen, thanks for your reply

Unfortunately the antennae are missing on this specimen; apart from that it would be OK except that there are 3 not 2 posterior bristles on the middle tibia, which is a main distinguishing feature of bitincta in Fonseca.

I have two similar females which have short-haired arista and 2 tibial bristles which I intend to post up if I can't nail them any other way; they are very distinctive with orange abdomen but with grey dust bands on the apical margins of tergite 3. Do they ring a bell at all?