Compsilura concinnata (Meigen), Blepharipa scutellata (Robineau-Desvoidy) and Apanteles 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 concinnata parasitized a greater proportion of the larvae occurring in the lower canopy of oak. Although no vertical stratification was noted for parasitism by Blepharipa scutellata, it was more prevalent in the low density site. Other parasitoids occurring in the sites studied included Phobocampe disparis (Vier.), Parasetigena agilis (Robineau-Desvoidy) and Exorista sp. These occurred in low numbers.