Giannasi et al. (2001) raised insularis and septentrionalis to species level.

[8] Head scalation consists of 10–11(12) upper labials, the first partially or completely fused to the nasal.

Head scales small, subequal, feebly imbricate, smooth or weakly keeled.

The supraoculars are narrow (occasionally enlarged and undivided) with 8–12 interocular scales between them.

[8] Found in Nepal, northeastern India (Assam, Himachal Pradesh and Jharkhand), Bangladesh, Myanmar, Thailand, Cambodia, Laos, Vietnam, southern China (Fujian, Hainan, Guangxi, Guangdong), Hong Kong, Macau, Indonesia (Sumatra, Java, Lombok, Sumbawa, Komodo, Flores, Sumba, Roti, Kisar, Wetar).