The within-plant distributions ofNabis americoferus(Carayon),N. roseipennisReuter, andN. rufusculusReuter differ in soybean.N. americoferusadults are located in the upper canopy, whereas adults of the other two species are located lower in the plant canopy. Early-instar nymphs of all three species are vertically separated from their respective adult stages. Nabids were observed to feed on a wide variety of arthropods including pest, beneficial, and innocuous species. The seasonal abundance of nymphalN. roseipennisand the within-plant overlap of its distribution with early instars of the green cloverworm suggested that it may be an effective predator on this pest species.N. roseipennisnymphs were successful in reducing numbers of green cloverworm larvae in the field in the presence of other predators and alternative prey under minimally modified conditions. Starting densities of 20–25 third instars per 0.9-m plot resulted in up to 50% reduction in subsequent green cloverworm populations.