Compsilura concinnata(Meigen),Blepharipa scutellata(Robineau-Desvoidy) andApanteles melanoscelus(Ratzeburg) were the dominant species in both the low eggmass density site (Cadwell Memorial Forest) and the high egg-mass density site (Ludlow Town Forest).Compsilura concinnataparasitized a greater proportion of the larvae occurring in the lower canopy of oak. Although no vertical stratification was noted for parasitism byBlepharipa scutellata, it was more prevalent in the low density site. Other parasitoids occurring in the sites studied includedPhobocampe disparis(Vier.),Parasetigena agilis(Robineau-Desvoidy) andExoristasp. These occurred in low numbers.