title: Protobothrops xiangchengensis
text: # Protobothrops xiangchengensis
  
  Protobothrops xiangchengensis, commonly known as the Szechwan pit viper, Kham Plateau pitviper, or Sichuan lancehead, is a venomous pit viper species endemic to the Hengduan Mountains in south-central China. No subspecies are currently recognized.
  
  ## Taxonomy
  
  Originally described as a member of the genus Trimeresurus, it was later reassigned to Protobothrops.
  
  ## Description
  
  Scalation includes 25 (23, 24) rows of dorsal scales at midbody, 175–194/181–194 ventral scales in males/females, 54–66/44–62 subcaudal scales and 7–8 (9 or 10) supralabial scales.
  
  ## Geographic range
  
  Protobothrops xiangchengensis is endemic to the Hengduan Mountains in the provinces of Yunnan and western Sichuan, China. According to David & Tong (1997), the type locality given is "Sichuan Province, Xiangcheng, altitude 3100 m [10,200 ft]".
  
  