Trimeresurus septentrionalis, commonly known as the Nepal pit viper or northern white-lipped pit viper, is a venomous pit viper species found in Bangladesh, Bhutan, Nepal and India.
Total length males 610 mm, females 730 mm.
The head scalation consists of 10âÂÂ11(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 9âÂÂ11 interocular scales between them. The temporal scales are smooth.
Midbody there are 21 longitudinal dorsal scale rows. There are 162âÂÂ172 ventrals in males, 160âÂÂ181 in females. The subcaudals are paired and number 68âÂÂ83 in males, 55âÂÂ71 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
It is found in Bangladesh, Bhutan, Nepal and northwestern India (Simla). The type locality is given as "Nepal 83<span style="font-size:100%;"><sup>o</sup></span> 55' 28<span style="font-size:100%;"><sup>o</sup></span> 15' 1500 m (Nähe Pokhara)". Regenass & Kramer (1981) list the type locality as "Hyangcha (Nepal) 83<span style="font-size:100%;"><sup>o</sup></span> 55' E.L. 28<span style="font-size:100%;"><sup>o</sup></span> 15' N.B. 1500 m". Holotype: MHNG 1404.31.
Elevated to a species, T. septentrionalis, by Giannasi et al. (2001). Returned to a subspecies, T. a. septentrionalis, by Leviton et al. (2003). Elevated to a species in another genus, Cryptelytrops septentrionalis, by Malhotra & Thorpe (2004). Returned to genus Trimeresurus and placed in subgenus Trimeresurus (Trimeresurus) by David et al. (2011). (See synonyms.)