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Hello Jürgen and treebeard,

Thank you very much for ID.
It seems that I have overlooked the genus Brachypalpus, because this specimen looks much stouter than other females photographed some years ago. I`ll store it as Brachypalpus cf. valgus.
Here
https://diptera.info/forum/viewthread.php?thread_id=48468&highlight=Brachypalpus&pid=210165#post_210165
is an old photo of another specimen from the same location photographed in June which should then be a Brachypalpus laphriformis with the dusted frons and dark arista (if nothing speaks against).

Best wishes,
Marion