by Alex » 02 Jun 2020 15:59
Welcome to the forum Olger!
It's better if you post a single topic per specimen, and simply reply to the same topic if you need to post more pictures than is allowed per post.
I suppose it could be longula, but males in the ignita-group are very hard to ID, even when you have the specimen at hand under a microscope.
Your best chance of getting a good ID is to use the morphometric excel sheet provided as a supplementary material in "ORLOVSKYTE, BUDRYS, BUDRIENE, RADZEVICIUTE, SOON 2016 Sibling species in the Chrysis ignita complex molecular, morphological and trophic differentiation of Baltic species". However it takes a long time to use, it needs many and accurate measurements of antennal segments, mandible dimensions, puncture diameters, etc to get a good ID.