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Wooaaw, Eric, |t "Crabronidae" was the "key" (Initialzündung) to me! I found pictures of Nysson spinosus (s. http://aramel.fre...r-23.shtml - last third of the page) which are really similar to "my" wasp. But there is the remark that N. spinosus is not to distinguish from Nysson interruptus by photographs.
Greetings Kuv