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Dear Gisela,


The fotos on your website are, based on my criteria for Xylota on pictures, indeed not X. nemorum. The abdomen is too long and there seems to be too much yellow on the base of tibiae 3.
So, the identification of the specimens in your collection might be perfectly right. Maybe the colouration of the tarsi is just very variable.
Which would, however, be quite curious, since it is rather constant in the larger Xylota-species, like meigeniana en coeruleiventris.

But then again, I am not a real expert, maybe Menno (?) can help

Theo