Nine species of naturally occurring hymenopterous parasites were recovered fromCnephasia longana(Haworth) in western Oregon. The most commonly recovered parasites were the braconidsAgathis cincta(Cresson),Bracon hyslopi(Viereck),B. gelechiae(Ashmead), and the ichneumonidEnytus eureka(Ashmead). Other parasites reared were the ichneumonsIschnus-inquisitorius atriceps(Cresson),Itoplectis conquistor(Say),I. quadricingulata(Provancher),Phytodietus burgessi(Cresson), andTranosema interrupta pterophorae(Ashmead).The incidence of parasitism was generally low, and larvae were not attacked until late in their activity period. There appears to be a preference differential between ichneumons and braconids in attacking omnivorous leaftier larvae infesting different host plants. None of the parasites introduced and released against the omnivorous leaftier in Oregon nearly 20 years ago have become established.