From the Continental Divide in Central Oaxaca (Distrito de Etla) to the lowlands of the isthmus of Tehuantepec (Mexico).
Holotype: NMNH 30085 according to Golay et al., 1993, Endogly. Venom. Snakes World 478pp.[166].
Type-locality: Pacific side of the Isthmus of Tehuantepec [Oaxaca, Mexico].