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 (partly through La Rioja) to Chile by the Paso de San Francisco (4722 m), 64 west from Santiago del Estero to join 38 and 157 north from La Guardia 103 km to Frias where it connects with 89 west from Villa San Martin (Santiago del Estero), and north to Tucuman province at San Pedro, connecting with 64 near Las Cañas. There is an airport at Catamarca. Since its foundation in 1991 by the Catamarcan branch of the Radical Civic Union and minor local parties the Civic and Social Front of Catamarca has dominated state politics. It has held the governor's