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Thank you, Henrik, for confirming, that it`s a male!

Now, with all the help from you and Theo and the keys today I could find out, that my first Conopidae, seen on sept, 15th, 2010, must also be Leopoldius and not Conops! Those pics were really funny five years ago, without macro lens. It is a female, also looks like L. calceatus, but I guess, this cannot be determined with these bad pictures, right?

Best regards, Thorsten