The Chinese tree viper (Trimeresurus stejnegeri) is a species of venomous pit viper endemic to Asia. It grows to a maximum total length of 75 centimeters (30 in), with a tail length of 14.5 centimeters (5.7 in). The males have hemipenes that are short and spinose beyond the bifurcation. Dorsal scales in 21 longitudinal rows at midbody. 9-11 upper labials, of which the first are separated from nasal scales by a distinct suture. The supraoculars are single, narrow, and sometimes divided by a transverse suture. There are 11-16 scales in a line between the supraoculars. The ventrals number 150-174, and the subcaudals are 54-77. All of the subcaudals are paired. Color pattern: above bright to dark green, below pale green to whitish, the two separated by a bright bicolored orange or brown (below) and white (above) (males) or bicolored or white only (females) ventrolateral stripe, which occupies the whole of the outermost scale row and a portion of the second row.