- Common names: Mexican lance-headed rattlesnake, lance-headed rattlesnake.
is a venomous pitviper species
found in central Mexico
. No subspecies are currently recognized.
Adults usually grow to 60-70 cm, although exceptionally large specimens may be as much as 100 cm in length.
Found on the plateau of central Mexico
from southern Zacatecas
and northeastern Colima
east to east-central Veracruz
. Occurs at elevations between 1,450 m and 2,600 m. The type locality
given is "Table Land, Mexico", although a restriction to "Tupátaro, Guanajuanto, Mexico" was proposed by Smith and Taylor (1950).
This species is classified as Least Concern (LC) on the IUCN Red List of Threatened Species
(v3.1, 2001). Species are listed as such due to their wide distribution, presumed large population, or because it is unlikely to be declining fast enough to qualify for listing in a more threatened category. The population trend is down. Year assessed: 2007.