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I'd guess Exorista too, just from the photo. Question to Walwyn - when keying it you should pretty easily get to couplet 112 in Belshaw's key (bare arista & eyes, bare vein R1 and along r4+5 to rm etc) - you should have gone pst there on your way to Bactromyia. So, do you think it has some black hairs behind the head, on top?