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Hello Reinoud,

Thank you again for all your reactions to my flies!
It seems that Tolmerus atricapillus is mostly found.
You asked about my environment. Here in Zeist we have many forests with many sandy places indeed and I don't think there are special places where I found them. Just anywhere. That is not a satisfying answer I guess. I may try to pay more attention to it this year. My environment has changed a lot last year, as they started cutting trees and levelling the fields.
I have the impression that last year I saw less than the year before.

Regards,
Hedy