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This small (c.5mm), female tachinid was found in a building on a nature reserve in south Essex, England on 27th July 2018. The surrounding area is mainly freshwater grazing marsh with some scrub and grassland.

I have keyed it out as Bactromyia aurulenta using both Belshaw and Tschorsnig & Herting. It also comes out as Bactromyia if I run it through MOSCHweb. All the characters seem to agree with that species except that the scutellar apicals do not appear to be raised as mentioned in couplet 226 of T&S.

As this is the first time I have come across the species I would be glad of a second opinion. It seems to be uncommon in Britain.