Kanburi Pit Viper, Cryptelytrops (formerly Trimeresurus) kanburiensis Smith, 1943. Photographed in Thailand. Adult maximum length about 700 mm. Inhabits tropical evergreen forests on limestone in western and southern Thailand. Females give birth to litters of 12-16.

Big Eyed Pit Viper, Cryptelytrops (formerly Trimeresurus) macrops Kramer, 1977. Photographed in central Thailand in the Khorat Basin. Upper photo the snake is feeding on a gecko. In the second photo this snake was perched on a branch next to a pond where frogs were calling. The bottom photo is a neonate found on the ground in wet forest at night. Adult maximum size about 720 mm. It inhabits Thailand, Cambodia, and south Vietnam.

Vogel's Beatutiful Pit Viper, Cryptelytrops (formerly Trimeresurus) venustus, Vogel, 1991. Photographed in southern Thailand in Khao Luang National Park. It was found at the base of a tree at the edge of an old rubber plantation. It has been confused with Trimeresurus kanburiensis in the literature.

Gray's Pit Viper, Cryptelytrops (formerly Trimeresurus) ?albolabris. This was a captive snake of unknown origin. T. albolabris is probably more than one species and the group is in need of revision.

Borneo Pit Viper, Tropidolaemus subannulatus (Gray, 1842). Photographed in the Danum Valley, Sabah, Malaysia (Island of Borneo). It was found along a road side in secondary forest. Adult maximum size is about one meter. Ranges from Thailand and Malaysia southward into Indonesia and east to the Philippines. Females give birth to as many as 41 young.