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I?m still impressed of your discussing, coming to the right answer.

Hans Bartsch tells it is a Chrysotoxum cautum. :D

C.cautum is rare here, but hot summers it sometimes appear in Stockholm too.


Is this too C. cautum? Seen three weeks later, 10 km away from the first one. It looks the same to me, but the pattern on abdomen is not quite alike. There is one more thin thread of yellow on this one.