I was completely wrong in my assumtion that is was my 'ususal' P. violaceus (I saw it 3 years in a row). This is the reply from Alex on hymis.de (Thanks Alex
!!!!!):
"Saw your photographs on Chrysis.net as well, its hard to say from the photographs, the scutal punctuation is very important when ID'ing
Omalus and relatives.
3 & 5 is
Omalus biaccinctus, as the scutum is shining and totally without punctures, but "rippled" in a wave like manner. It is not P. violaceus as that species have obvious punctures on the scutum, at least posteriorally between the notauli, and a much more pronounced cavitas frontalis.
The other wasp looks much more punctured on the scutum, and as such would likely be a Pseudomalus sp.
/Alex
EDIT: About the colours, O.
biaccinctus and the other "two coloured" species, the abdomen colour varies a lot, both between individuals but even more so depending on the viewing angle and lighting."
The discussion wasn't over, see here:
http://www.forum.hymis.de/viewtopic.php?f=14&t=10897