Thai National Parks

Snakes of Thailand

Species of Thailand

White-lipped pit viper

In Thai: งูเขียวหางไหม้ท้องเหลือง, ngu khieow hang mai thong lueang

Binomial name: Trimeresurus albolabris, John Edward Gray, 1842

Trimeresurus albolabris, the white-lipped pit viper, is a venomous pit viper species endemic to Southeast Asia.


Maximum total length males 600 mm, females 810 mm; maximum tail length males 120 mm, females 130 mm.

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. Temporal scales smooth.

Midbody has 29 (rarely 19) longitudinal dorsal scale rows. The ventral scales are 155–166 in males, 152–176 in females. The subcaudals are paired, 60–72 in males, 49–66 in females. The hemipenes are without spines.

Color pattern: green above, the side of the head below the eyes is yellow, white or pale green, much lighter than rest of head. The belly is green, yellowish or white below. A light ventrolateral stripe is present in all males, but absent in females. The end of tail is not mottled brown.

Common names

Common names include green tree pit viper, white-lipped pit viper, white-lipped tree viper, white-lipped green pit viper and white-lipped bamboo pit viper.

Geographic range

Found in Nepal northeastern India (Assam and Jharkhand), Bangladesh, Myanmar, Thailand, Cambodia, Laos, Vietnam, southern China (Fukien, Hainan, Kwangsi, Kwangtung), Hong Kong, Macau, Indonesia (Sumatra, Java, Lombok, Sumbawa, Komodo, Flores, Sumba, Roti, Kisar, Wetar). The type locality given is "China".


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

Malhotra & Thorpe (2004) transferred this species (and a number of others) to the genus Cryptelytrops. David et al. (2011) returned it to the genus Trimeresurus and assigned it the subgenus Trimeresurus, creating the new combination Trimeresurus (Trimeresurus) albolabris.


Its meals consist of birds, small frogs, and small mammals. This snake doesn't strike and release its prey; like many arboreal snakes, it strikes and holds on to the prey item until it dies.


Results of bites from this species range from mild envenoming to death. The venom of white-lipped pitviper contains procoagulant properties. There have been numerous reported bites with few fatalities.

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Scientific classification

Trimeresurus albolabris

Common names

  • German: Weisslippen-Bambusotter
  • English:
    • White-lipped pit viper
    • Green pit viper
    • White-lipped tree viper
    • White-lipped bamboo viper
    • White-lipped island pit viper
    • Northern white-lipped pit viper
    • White-lipped green pit viper
  • Thai: งูเขียวหางไหม้ท้องเหลือง, ngu khieow hang mai thong lueang


  • T. a. albolabris, John Edward Gray, 1842

    Common name: White-lipped pit viper

    Range: Bangladesh, Cambodia, China (Fujian, Guangdong, Hainan, Hong Kong, Jiangxi, Guangxi, Guizhou and Yunnan), India (Assam and Nicobar Islands), Indonesia (Sumatra, Bangka, western Java and Madura), Laos, Myanmar, Thailand and Vietnam.

  • T. a. insularis, Eugen Kramer, 1977

    Common name: White-lipped island pit viper

    Range: Indonesia: eastern Java, Bali, Lombok, Sumbawa, Sumba, Komodo, Rinca, Flores, Adonara, Lembata, Pantar, Alor, Roti, Semau, Timor, Wetar, Kisar and Romang.

  • T. a. septentrionalis, Eugen Kramer, 1977

    Common name: Northern white-lipped pit viper

    Range: Northern India (Kashmir) and Nepal.


  • Cryptelytrops albolabris, Tanya Chan-Ard et al. (2015)
  • Trimeresurus albolabris, Van Stanley Bartholomew Wallach et al. (2014)
  • Trimeresurus (Trimeresurus) albolabris, Patrick David et al. (2011)
  • Cryptelytrops albolabris, Anita Malhotra & Roger Stephen Thorpe (2004)
  • Trimeresurus albolabris, Roy W. McDiarmid, Jonathan A. Campbell & T'Shaka A. Touré (1999)
  • Trimeresurus albolabris albolabris, Merel J. Cox et al. (1998)
  • Trimeresurus albolabris, Ulrich Manthey & Wolfgang Grossmann (1997)
  • Trimeresurus albolabris albolabris, Kenneth R. G. Welch (1994)
  • Trimeresurus albolabris albolabris, Urs Regenass & Eugen Kramer (1981)
  • Trimeresurus albolabris albolabris, Eugen Kramer (1977)
  • Trimeresurus albolabris, Clifford Hillhouse Pope & Sarah Haydock Pope (1933)
  • Trimeresurus gramineus albolabris, R. Mell (1929)
  • Lachesis grammineus (sic), Léo Daniël Brongersma (1929)
  • Lachesis gramineus albolabris, R. Mell (1922)
  • Lachesis gramineus, George Albert Boulenger (1896)
  • Trimeresurus purpureomaculatus var. bicolor), George Albert Boulenger (1890)
  • Bothrops erythrurus, Theodorus Willem van Lidth de Jeude (1890)
  • Trimeresurus gramineus, George Albert Boulenger (1890)
  • Trimeresurus albolabris, William Theobald (1879)
  • Trimesurus albolabris, John Edward Gray (1849)
  • Trigonocephalus gramineus, Theodore Edward Cantor (1847)
  • Trigonocephalus viridis, Hermann Schlegel & Salomon Müller (1842)
  • Trimesurus albolabris, John Edward Gray (1842)
  • Trimeresurus albolabris, John Edward Gray (1842)
  • Coluber gramineus, Thomas Stamford Raffles (1822)

Free photo downloads

Photos below for this species are published under Creative Commons license, means completely free for download. No need to ask for our permission to publish these on various media. Click the thumbnails for more details & download options.

  • Trimeresurus albolabris (female)
  • Trimeresurus albolabris (female)
  • Trimeresurus albolabris (female)
  • Trimeresurus albolabris (juvenile, male)
  • Trimeresurus albolabris (male)

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)


Trimeresurus albolabris (female)
Trimeresurus albolabris (male)
Trimeresurus albolabris (female, red-eyed)
Trimeresurus albolabris (female, brownish eyed)
Trimeresurus albolabris (female)
Trimeresurus albolabris (male)
Trimeresurus albolabris (juvenile, male)
Trimeresurus albolabris (juvenile, female)

Range Map

Distribution map of White-lipped pit viper, Trimeresurus albolabris in Thailand
  • Ban Lat District, Phetchaburi
  • Ban Na San District, Surat Thani
  • Bang Kruai District, Nonthaburi
  • Bang Saphan District, Prachuap Khiri Khan
  • Chiang Dao Wildlife Sanctuary
  • Doi Inthanon National Park
  • Doi Phu Kha National Park
  • Doi Suthep-Pui National Park
  • Hua Hin District, Prachuap Khiri Khan
  • Huai Kha Khaeng Wildlife Sanctuary
  • Huai Yang Waterfall National Park
  • Kaeng Krachan District, Phetchaburi
  • Kaeng Krachan National Park
  • Kaeng Tana National Park
  • Kanchanadit District, Surat Thani
  • Kham Thale So District, Nakhon Ratchasima
  • Khao Dinsor (Chumphon Raptor Center)
  • Khao Yai National Park
  • Khlong Saeng Wildlife Sanctuary
  • Kui Buri District, Prachuap Khiri Khan
  • Kui Buri National Park
  • Mae Fa Luang District, Chiang Rai
  • Mae Taeng District, Chiang Mai
  • Mae Wong National Park
  • Mueang Kanchanaburi District, Kanchanaburi
  • Mueang Mae Hong Son District, Mae Hong Son
  • Mueang Nakhon Ratchasima District, Nakhon Ratchasima
  • Mueang Nakhon Sawan District, Nakhon Sawan
  • Mueang Phetchaburi District, Phetchaburi
  • Mueang Phichit District, Phichit
  • Mueang Prachuap Khiri Khan District, Prachuap Khiri Khan
  • Na Yong District, Trang
  • Nam Nao National Park
  • Namtok Phlio National Park
  • Pak Chong District, Nakhon Ratchasima
  • Pak Thong Chai District, Nakhon Ratchasima
  • Pang Sida National Park
  • Pathio District, Chumphon
  • Phanom District, Surat Thani
  • Photharam District, Ratchaburi
  • Phu Luang District, Loei
  • Phu Luang Wildlife Sanctuary
  • Phu Suan Sai National Park
  • Phu Wua Wildlife Sanctuary
  • Prachantakham District, Prachinburi
  • Pua District, Nan
  • Sai Yok National Park
  • Sakaerat Environmental Research Station
  • Samoeng District, Chiang Mai
  • Sawi District, Chumphon
  • Song Khwae District, Nan
  • Song Phi Nong District, Suphan Buri
  • Suan Phueng District, Ratchaburi
  • Sung Noen District, Nakhon Ratchasima
  • Ta Phraya National Park
  • Tat Mok National Park
  • Tha Song Yang District, Tak
  • Tha Yang District, Phetchaburi
  • Thong Pha Phum District, Kanchanaburi
  • Thung Yai District, Nakhon Si Thammarat
  • Umphang District, Tak
  • Watthana Nakhon District, Sa Kaeo
  • Wichian Buri District, Phetchabun
  • Yan Ta Khao District, Trang
Range map of Trimeresurus albolabris in Thailand