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Dear Theo, I see my fly is still working in your brain! Many thanks for pointing out the valuable paper by Verbeke, it's great. I'd like to sum up the clues in his key for females:
As you said, metatarsus 3 is too long for B. johannis. So we have to discriminate between B. lanigerus and B. varipes. Both are said to have a bulge (callus) between the eyes just before insertion of the antennae.
B. lanigerus:
- small species
- callus small, round, inconspicuous
- thorax completely black
- femur 1 with fine yellow pilosity, hairs not prickly
B. varipes:
- bigger and robuster
- callus conspicuous, in the shape of a "V"
- thorax reddish on the pleura
- antero- and posteroventral pilosity of femur 1 conspicuously prickly
So, to me all these characters clearly point to B. varipes! I add another picture to illustrate them. Can I convince you?
Best wishes, Claudia (Sundew)