Crotalus transversus


 * Common names: Cross-banded mountain rattlesnake 

Crotalus transversus, or the Cross-banded Mountain Rattlesnake, is a venomous pit viper species found in central Mexico, known from less than 20 specimens. No subspecies are currently recognized.

Description
Adult females grow to a maximum recorded length of 46.5 cm. The length of the tail represents 10.5% of total body length in males and 7.1-7.9% in females.

Geographic range
It is found in central Mexico in the Sierra Ajusco and the Sierra de Monte Alto of the Transverse Volcanic Cordillera in the states of México and Morelos at elevations exceeding 2,900 m in temperate boreal forests. The type locality given is "about 55 km. SW México (city), near Tres Marías (Tres Cumbres), Morelos [Mexico], elevation about 10,000 ft." (3,000 m)

Conservation status
This species is classified as Least Concern on the IUCN Red List of Threatened Species. The population trend was stable when assessed in 2007.