Parasites predators had an insignificant effect on a population of the introduced weevil,Rhinocyllus conicusFroelich, during the 1975 through 1977 growing seasons in Montana. Predation upon adult weevils was unsuccessfully attempted by several spider, four ant, and one tiger beetle species. One species of bird was an incidental predator of adult weevils. No parasitism was observed among eggs, pupae, or adults. Two native species of Hymenoptera caused low levels of parasitism<1%) among larvae.