Little data exist concerning nitrite toxicity in non-fish vertebrates. A previous study by the authors reported nitrite induced methemoglobinemia in bullfrog tadpoles, Rana catesbiana. For comparative purposes, the study reported in this paper was designed to determine the 96 hr LC-50 for aquatic larvae of the salamander (Ambystoma texanum). In addition, environmental chloride levels were increased in one trial to test if this monovalent anion functions to suppress nitrite lethality as reported for fishes and crayfish. Study materials, methods and results are discussed. Refs.