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Ah - you posted a very similar couple here: https://www.flick...8338925526! I thought of Neoepitriptus, but in Reinoud's photo guide (https://waarnemin...ilidae.pdf) N. setulosus is described as "femora black with a red stripe on the backside; red tibiae apically black with darkened backside" - the pictured flies look dark grey, even the wings, while ours have a red/brown appearance. I wonder if the colouration might be thus variable. Maybe Reinoud will enlighten us.
BTW, Neoepitriptus seems to be included in Machimus now, as is Tolmerus.
Many thanks for your hint!
Regards, Sundew