Gloydius brevicaudus

Gloydius brevicaudus, the short-tailed pit viper or short-tailed mamushi, is a pit viper endemic to China and the Korean Peninsula; the Reptile Database also lists records from far-eastern Russia. Adults are relatively stout, with a broad head and a short tail, as the scientific name suggests. (The Reptile Database; Wikipedia, general species account)

The largest male measured in one study was 71 cm in total length and the largest female 69 cm. Typical scalation includes 21 dorsal scale rows at midbody, 135–149 ventral scales and 30–44 mostly paired subcaudals, and the tip of the tail is yellow. (Wikipedia, general species account)