Hello Hedy! Welcome to Chrysis.net Forum!
You have posted really great pictures, it's a pleasure for us to host them.
This specimen belongs to
Elampus genus, the species could be probably
Elampus panzeri (Fabricius 1804), well known from Europe and from Holland.
My compliments to you for the beautiful picture.
I ask to you the permission to use it for the
Database of the Italian Chrysididae.