Scapteriscus vicinus, a herbivore, and S. acletus, a carnivore, are reputed to damage severely Bahiagrass (Paspalum notatum) pastures, yet no direct evidence conclusively implicates either species. Major damage might be caused by either, both, or neither species. We assayed the effects of the 2 species by augmenting populations at sites in 3 pastures. Releasing ca. 16,000 vicinus or ca. 9,000 acletus adults at the centers of circular plots had little, if any, effect on Bahiagrass stand during the next 7 months.