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Hmm, looks a bit of a difficult one ... but Theo has seen a lot more than me so it must be solivaga :)

Possibly Belshaw's key a bit confusing with the leg bristles ... Tschorsnig just mentions "2 ad" for nigripes but in Belshaw he confuses it by saying "long bristles", implying that short ones are discounted. In this photo I can see 2 long bristles and 2 shorter ones ... but perhaps they are long enough. The ve is also very small ... I'll recheck some of my specimens when I get some time. :)