... tergite) from above wouldn't be amiss either ;) Its most likely not C. taczanovskii they should not be this coloured in my experience and the head ... ocellus" occurs in many places in Chrysidini, and in different Chrysis species groups.
I think that your specimen is a female of ChrysistaczanovskiiRadoszkowski. Diagnostic are the long and subparallel genae and, shape of anal teeth, colour of the abdomen on the second tergite and general habitus elongated.
I have one specimen - female from Eastern Ukraine (south of Donetsk region). It looks like to be Chrysis (Cornuchrysis) quadrispina Byusson, 1887 (obviously it belongs to cerstes group). Please, help to confirm the ID.
... in literature and not listed before. New species described in 2012 : Chrysis alcudiae Reder & Arens, 2012. Spain: Balearic Is. Hedychridium ... & Nikol'skaya), 1967) ( Chrysis ( Tetrachrysis )) MOLDAVIA: Izmail (taczanovskii group) The total number of European taxa is now increased to ...
The images are done with Canon 7D and Canon MP-E 65. Offcourse with the help of photostacking software (I have buyed HeliconFocus, as I preffer that to the others).