Does anyone happen to have information on the predatory behaviour of Crossocerus megacephalus? I ask because a few years ago I found a nest of this species in the SE of England and upon investigation it was found to contain three brood chambers. The larvae in two of these chambers had completed their development; however the third was still sealed and inside there were 15 Chrysopilus asiliformis.
Is this wasp a specialist on rhagionids or do you think what I found was a consequence of a local abundance of this fly species?
Any insights greatly appreciated.