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Should have added - could be Neomyia sp [Muscidae], but I thought the M vein bend was probably too sharp (can't see it very well though). Doesn't seem overly endowed with thoracic bristles and it is holding its antennae quite close to its face though. Hmm - the more I think about it the more it could be Neomyia, but still favour Chrysomyia at the moment:D