Field populations of Porthetria dispar (L.) and its natural enemies Apanteles melanoscelus (Ratzeburg) (Hymenoptera: Braconidae), Blepharipa scutellata (Robineau-Desvoidy) (Diptera: Tachinidae), Parasctigena agilis (Robineau-Desvoidy) (Diptera: Tachinidae), and Calosoma sycophanta (L.) (Coleoptera: Carabidae) were sampled during one summer and related by regression analysis. Natural enemies did not attack a greater proportion of gyspy moths at higher population densities of the latter, and so were not acting in a positive density-dependent manner at the time of the study. Also, absolute numbers of adult natural enemies were not postively correlated with gypsy moth numbers, implying that the natural enemies did not aggregate where gypsy moths were most abundant.