Bamboo Pit Viper
Trimeresurus stejnegeri is a species of venomous pit viper endemic to Asia. Three subspecies are currently recognized, including the nominate subspecies described here.
Rostral scale as deep as broad or broader than deep; upper head-scales small, smooth, imbricate; supraocular scale narrow, rarely broken up; internasals in contact or separated by one or two scales; 8 to 13 scales on a line between the supraoculars; usually one or two, rarely three, series of scales between the suboculars and the labials; 9 to 12 upper labials, second usually forming the anterior border of the loreal pit, third largest; temporal scales smooth.
Dorsal scales more or less distinctly keeled, in 21 (rarely 19 or 23) rows. Ventrals 145-175; anal scale entire; subcaudals in two rows 53-76
Upper parts usually bright green, rarely yellowish, greyish, or purplish brown, with or without black, brown, or reddish spots; usually a light, white, yellow, or red streak along the outer row of scales; end of tail frequently yellow or red; lower parts green, yellow, or whitish.
Grows to a total length of 3.25 feet (0.99 m); tail 5.5 inches (14 cm).