Bothrops neuwiedi subtriangular, or headphone-shaped and oppose each other middorsally. The belly is white or yellow with gray speckling. Juveniles have a white tail tip. This species is found in South America east of the Andes and south of approx. 5°S, including Brazil (southern Maranhão, Piauí, Ceará, Bahia, Goiás, Mato Grosso, an isolated population in Amazonas, Rondônia and all southern states), Bolivia, Paraguay, Argentina (Catamarca, Córdoba, Corrientes, Chaco, Entre Ríos, Formosa, Jujuy, La Pampa, La Rioja, Mendoza, Misiones, Salta, San Juan, San Luis, Santa Fe, Santiago del Estero and Tucumán) and Uruguay. According to Vanzolini (1981), the type locality given is ""provincia
Catamarca Province the Snow-Covered Summits of Aconquija, and the San Francisco Pass. The road over the San Francisco Pass, an endeavor developed during the Castillo Administrations (1991–2003) at a high cost in public funds has failed to bring trade and tourism to the underdeveloped Tinogasta county. Cultural attractions include the city of Catamarca, the archaeological park "Las Huellas del Inca", prehistoric petroglyphs, local music, handcrafts and wines. Major highways include Ruta 33 from Catamarca 98 km south to San Martin, 38 from Catamarca north via San Pedro 228 km to Tucuman, 60 north-west from Córdoba Province 577 km from La Guardia north-west