Eastern Mountain Pit Viper

The Eastern mountain pit viper (Ovophis makazayazaya), also called the Taiwan or Oriental mountain pit viper, is a venomous snake native to southeastern China, northern Vietnam, Laos and Taiwan. In China it is recorded from provinces including Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hunan, Shaanxi, Sichuan, Yunnan and Zhejiang. (The Reptile Database; Wikipedia, general species account)

It was previously treated as a subspecies of Ovophis monticola and was proposed as a full species in 2011. Total length ranges from 49 to 110 cm, with females larger than males, and the species is diagnosed by an enlarged fourth supralabial scale and paired subcaudal scales. (Wikipedia, general species account)