Hebius weixiensis
Range
Weixi County and Shigu Township near Lijiang, Yunnan, China (endemic)
Size
Snout-vent length 290–475 mm in males, 287–520 mm in females
The Weixi keelback snake (Hebius weixiensis) is endemic to China and known from around Lijiang in Yunnan, including Weixi County, its type locality, and Shigu Township. (The Reptile Database; Wikipedia, general species account)
Males measure 290–475 mm and females 287–520 mm in snout-vent length, with tails of 60–163 mm in males and 88–160 mm in females. (Wikipedia, general species account)