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Hello Angelika/Reimund,
this is a nice speciment. In my opinion it is not E. similis. It don´t feel like one and the pterostigma look different. Althou I don't know, which species it is. Better look at the wings would be helpful. And what look most important to me is, that this speciment do have yellow femur.
I hope, someone will tell us, which Eristalis it is.
Best wishes

Anežka