Hello Paolo, this is the best I could get, sorry. First I determined the specimen as ambigua by Linsenmaier's key, and features of ambigua lygaea Lins., 1997 from Southern Russia seemed very similar, than I began to doubt and translated original descriptions, but ...
... Linsenmaier, the colour of the thorax of your specimen is typical for Chrysis cerastes , but the short malar spaces and shape of the genae is the one of Chrysisambigua . I cannot see the shape of the head in dorsal view, could you take: 1. an other ...
... reared from the nest of Eumenid wasp in the Crimea (Ukraine). It obviously belongs to Cornuchrysis and to cerastes -goup within it. I think it is Chrysis cerastes Ab., 1877, though species of this group are hard for ID for me. Can anyone confirm? or it is other species? Thanks for the attention, ...