Twelve species of field-collected arthropod predators suspected of feeding on alfalfa weevilHypera postica(Gyllenhal) (Coleoptera: Curculionidae) larvae were studied in the laboratory. Most experiments used weevil instars III and IV. In one type of test, weevil larvae were the only prey; the other type permitted a choice of weevil larvae,Lygusspp. nymphs and pea aphid adultsAcyrthosiphon pisum(Harris).Hippodamia convergens(Guérin) (larvae and adults),Coccinella transversoguttata(Faldermann) (adults),Nabisspp. (adults), andChrysopa oculata(Say) (larvae) preferred aphids. In the absence of aphids, the coccinellids were active weevil predators. The spidersTibellus oblongus(Walckenaer) andXysticussp.;Collops vittatus(Say),Collops bipunctatus(Say) andForficula auriculariaLinn. (all adults), appeared to be opportunistic feeders. The latter ranked among the more effective weevil predators.Agullasp. (adults) ate very few weevil larvae. Instar IV prey were too large for some smaller predators.