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Thanks a lot Eric!

I'm posting one more picture, I’m not sure if it’s the same individual though. At this moment there are 5 very similar individuals feeding on Levisticum officinale. What we noticed is that the combination of the black and yellow colors are slightly different on their abdomens. There is another species resembling this one and hanging around with them which was recognised on Hymenopterists Forum as a Diphyus quadripunctorius.