Common names: northern white-lipped pitviper.

Trimeresurus septentrionalis is a venomous

Venomous snake

"Poisonous snake" redirects here. For true poisonous snakes, see Rhabdophis.Venomous snakes are snakes which have venom glands and specialized teeth for the injection of venom...

 pitviper

Crotalinae

The Crotalinae, commonly known as "pit vipers" or crotaline snakes, are a subfamily of venomous vipers found in Asia and the Americas. They are distinguished by the presence of a heat-sensing pit organ located between the eye and the nostril on either side of the head...

 subspecies

Subspecies

Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

 found in Nepal and India.

Description

Total length males 610 mm, females 730 mm.

The head scalation consists of 10-11(12) upper labials, the first of which are fused to the nasal. The head scales are small, subequal and feebly imbricate, smooth or weakly keeled. The supraoculars are narrow and undivided with 9-11 interocular scales between them. The temporal scales are smooth.

Midbody there are 21 longitudinal scale rows. There are 1162-172 ventrals in males, 160-181 in females. The subcaudals are paired and number 68-83 in males, 55-71 in females. The hemipenes are without spines.

The colour pattern is green above. The belly is green, yellowish or white below. A faint ventrolateral stripe present in all males, but absent in females. The end of tail not mottled brown.

Holotype: MHNG 1404.31

Geographic range

Nepal

Nepal

Nepal , officially the Federal Democratic Republic of Nepal, is a landlocked sovereign state located in South Asia. It is located in the Himalayas and bordered to the north by the People's Republic of China, and to the south, east, and west by the Republic of India...

 and northwestern India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

 (Simla

Shimla

Shimla , formerly known as Simla, is the capital city of Himachal Pradesh. In 1864, Shimla was declared the summer capital of the British Raj in India. A popular tourist destination, Shimla is often referred to as the "Queen of Hills," a term coined by the British...

). The type locality is given as "Nepal 83^o 55' 28^o 15' 1500 m (Nähe Pokhara)." Rgenass & Kramer (1981) list the type locality as "Hyangcha (Nepal) 83^o 55' E.L. 28^o 15' N.B. 1500 m." Holotype: MHNG 1404.31.