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John

Thanks for this. I based my ID on Stubbs' key and descriptions. The third antennal segment appears to be dusted, but there is no orange. I'm not up to dissecting genitalia unfortunately. This specimen does have the pale hairs mixed in with the black on the thorax in the way Stubbs describes it for M hirtella (with M aerosa having entirely black hair). Also according to Ball and Morris's Atlas, M hirtella is widespread and common in the UK, whilst M aerosa is mainly northern and western (the specimen comes from the south east).