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Thanks for reply. I found in Veen's key about Ch. bergenstammi:
1. Eyes: hairs all white to pale brown
I see black
2. bristles at hind margin scutellum black or black and yellow
I don't see black bristles, only yellow. I thought about its rather as long hairs, not bristles but I'm not sure in this case.
3. tarsae: most segments pale
I see all dark
Are you sure it's Ch. bergenstammi?