Hi very nice pictures! About the ID, they could be female (first picture) and male (second and third) of Chrysis alternans Dahlbom. Linsenmaier (1999) included in the keys also an other species Chrysis elegantula Spinola, however the identification of your specimens is not ...
... wonderfull pictures, thanks for sharing! I cannot help you with the species ID, although I'm quite sure you are correct in that they belong to Chrysis . Remember that holometabolic insects (ie insects that have a larval stage-> pupa->adult) never grow as adults. Also the metallic colours of ...
... and I have had photos 2 and 3 identified as Chrysissemicincta, which I have no reason to doubt. But would that be subspecies tricolor? Also do these grow significantly and fade as they get ...