Thanks John, I saw a lot of them on the net and mostly were IDed as Ampulex compressa, which indeed looks different. Thanks for the new family name. I think you are correct and these ones might be the same ones as Florian's:
http://www.flickr.com/photos/74904085@N03/6741174713/
http://www.flickr.com/photos/glenespn/5489241856/
Not an Ampulicidae - the pronotum (front of thorax) is all wrong.
Seems to be a type of spider wasp - family Pompilidae
http://en.wikipedia.org/wiki/Spider_wasp
Looks like some kind of an Emerald Wasp, Ampulicidae. Common genus is Ampulex and a famous one is Ampulex compressa, which yours is not!
http://www.flickr.com/photos/74904085@N03/6741174713/
http://de.wikipedia.org/wiki/Juwelwespe
http://phenomena.nationalgeographic.com/2013/01/07/if-youre-going-to-live-inside-a-zombie-keep-it-clean/
http://de.wikipedia.org/wiki/Ampulicidae
Might also be an other genus than Ampulex!
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