Oligodon nagao
Range
Northern Vietnam, central Laos and Guangxi (China)
Size
Body up to 680 mm; tail up to 107 mm
The Nagao kukri snake (Oligodon nagao) is a colubrid collected in Lang Son and Cao Bang in northern Vietnam, Khammouane in central Laos and the Guangxi Autonomous Region in southern China. (The Reptile Database; Wikipedia, general species account)
It has 15 or 17 dorsal scale rows at midbody, a short tail of up to 107 mm and a body up to 680 mm long. (Wikipedia, general species account)