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... and if all the above is right, the final decision is about the colour of the tibiae: dark brown to black, only slightly paler than the femora leads to Crumomyia notabilis, whereas yellow/brown, distinctly paler than femora to C pruinosa. The attached photo looks closer to the former to me, and hence to an ID of Crumomyia notabilis.

But is this right?

Please help!