Hebius septemlineatus
Range
Western Yunnan, China (endemic); type locality Tengchong
Size
Snout-vent length 198–520 mm in males, 316–408 mm in females
The Tengchong keelback snake (Hebius septemlineatus) is endemic to western Yunnan, China, and takes its name from its type locality, Tengchong. (The Reptile Database; Wikipedia, general species account)
Males measure 198–520 mm and females 316–408 mm in snout-vent length, with tails of 66–177 mm in males and 94–142 mm in females. (Wikipedia, general species account)