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Interesting observation by Eric. These yellow spots shouldn't be there, according to Rozkosny (1982).
"Mesonotum medially black, at most with small yellow spots on notopleura, transverse suture and postalar calli'

That said, I totally agree with male nigricornis.

@Helge, it would be helpful if you could mention altitude, especially in those cases in which the altitude is above 1000 m. Thanks


Theo