N.a.v. de suggestie van Grusgrus en Heijerman heb ik een email gestuurd naar John Noyes, genoemd op de website van het Natural History Museum, pagina Chalcidoidea,
http://www.nhm.ac.uk/research-curation/projects/chalcidoids/Hij mailde het volgende terug:
So far as you insect is concerned, it looks very much like a
platygastrid which are mostly egg-larval parasitoids of cecidomyiids and
similar insects. To my knowledge, none is known to be a parasitoid of
butterlfy eggs. The sister family of Platygastridae is Scelionidae and
these are egg parasitoids of several groups of insects, especially
Lepidoptera. However, I do not think that the insect you have
photographed is a scelionid. Unfortunately these families do not belong
to the Chalcidoidea and are therefore not included in the UCD.
Dat wordt dus verder zoeken!
It may just be that your insect just happened to land on the butterfly,
or perhaps it is even merely "hitch-hiking" with no other intent.
Het laatste is uiteraard logisch gezien correct: een foto bewijst niets; maar deze is wel suggestief!
Cor Zonneveld