Common names: Central American jumping pit viper.Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. 2 volumes. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. .
Metlapilcoatlus mexicanus is a pit viper species endemic to Mexico and Central America.
Description Adults grow to an average of 50–70 cm (about 20–28 inches) in total length. The maximum total length is for males and for females. The body is extremely stout.
Geographic range Found in the Atlantic drainage from Mexico (in the Mexican states of Tabasco and Chiapas) south to the Canal Zone in Panama, both slopes of Costa Rica and Panama. Occurs at elevations of . The type locality given is "Coban, capitale de la province de la Véra-Paz, (République de Guatemala, Amérique centrale)" (Cobán, Alta Verapaz, Guatemala).
Taxonomy Regarded as a full species, Metlapilcoatlus mexicanus, by Campbell and Lamar (2004).
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