Abstract
Two similarly marked red and black hemipterans, the plant bug, Lopidea instabile (Miridae) and the seed bug, Neacoryphus bicrucis (Lygaeidae), are unpalatable to the lizard, Anolis carolinensis, when reared on their natural alkaloid-bearing food plants. Insects reared on non-alkaloid-bearing seeds do not possess alkaloids and are palatable to anoles. Anoles which have sampled and rejected one of the hemipteran species rarely attack the other species in feeding trials, suggesting that the 2 insect species may function as muellerian mimics.