Seventy captive adult female wasps of the eumenid genera Ancistrocerus and Euodynerus were observed to feed on multiple prey items. It was shown experimentally that E. foraminatus females that fed on prey had significantly larger egg volumes than adult wasps deprived of prey.
Chilcutt, Charles F. and Cowan, David P.
"Carnivory in Adult Female Eumenid Wasps (Hymenoptera: Vespidae: Eumeninae) and Its Effect on Egg Production,"
The Great Lakes Entomologist: Vol. 25
, Article 8.
Available at: http://scholar.valpo.edu/tgle/vol25/iss4/8