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Genus Porthidium
Dunn's Hognose Viper - Adults are usually 30-40 cm in length, with a maximum of 57 cm.
Western Hognose Viper - Know from only four specimens: two females with locality data and two other specimens without.
Hognosed Pit Viper - Adults are usually less than 40 cm in length, and rarely more than 60 cm.
Yucat - Adults are usually 35-45 cm in length, although some specimens may exceed than 55 cm.