Crotalus basiliscus is a venomous pitviper species found in western Mexico. The specific name is derived from the Greek word for king, basiliskos, and is an allusion to this snake's large size and potent venom. No subspecies are currently recognized. This is one of the largest rattlesnake species. Specimens exceeding 150 cm are not uncommon, while the maximum size reported is 204.5 cm. The body is moderately stout and rather rectangular in cross section. Midbody there are 25-29 rows of strongly keeled dorsal scales. The ventral scales number 174-206 and the subcaudals 18-36.

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