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I am sorry I didn't react on your answer earlier Ectemnius. I only saw it today. I had placed the fly later in the diptera adults forum and got a reply that it could well be Spilomyia manicata, but the person said he wasn't an expert.

http://www.diptera.info/forum/viewthread.php?thread_id=63945

So I will leave it undecided and hope that I will see the species again this year.

Thank you very much,