Thai National Parks

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Reptiles of Thailand

Species of Thailand

Indo-Chinese rat snake

Thai: งูสิงธรรมดา, ngu sing tammada

Binomial name: Ptyas korros, Hermann Schlegel, 1837

Ptyas korros, commonly known as the Chinese ratsnake or Indochinese rat snake, is a species of colubrid snake endemic to Southeast Asia.


Snout obtuse, projecting; eye very large. Rostral visible from above; internasals shorter than the prefrontals; frontal as long as its distance from the tip of the snout or a little longer, as long as the parietals; two or three loreals; a large preocular, sometimes touching the frontal; a small subocular below; two postoculars; temporals 2 + 2; eight upper labials, fourth and fifth entering the eye; five lower labials in contact with the anterior chin-shields, which are shorter than the posterior.

Dorsal scales smooth or feebly keeled on the posterior part of the body, in 15 rows at midbody; ventrals 160-177; anal divided; sub-caudals 122-145.

Brown or olive above; the scales on the posterior part of the body and on the tail often yellow and edged with black. Lower surface yellow. Young specimens with transverse series of round whitish spots or with narrow yellow transverse bars.

Length of head and body 1080 mm; tail 700 mm.


Myanmar; Cambodia, China (Zhejiang, Jiangxi, Fujian, Guangdong, Hainan, Guangxi, Hunan, Yunnan, Hong Kong), India (Assam; Arunachal Pradesh (Namdapha - Changlang district, Chessa, Chimpu, Itanagar - Papum Pare district), Bangladesh, Indonesia (Sumatra, Borneo, Java, Bali), Laos, Taiwan, Thailand, Vietnam, West Malaysia, Singapore Island

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Scientific classification

Ptyas korros

Common names

  • German:
    • Indochinesische Rattenschlange
    • Indomalayische Rattenschlange
  • English:
    • Chinese ratsnake
    • Indo-Chinese rat snake
  • Thai:
    • งูสิงธรรมดา, ngu sing tammada
    • งูเห่าตาลาน, ngu haow taa lan
    • งูสิงอ้อย, ngu sing oi


  • Ptyas korros, Van Stanley Bartholomew Wallach et al. (2014)
  • Ptyas korros, Thomas Ziegler (2002)
  • Ptyas korros, Theadora Pinou & Herndon Glenn Dowling (2000)
  • Coluber korros, James Draper Lazell (1998)
  • Ptyas korros, Merel J. Cox et al. (1998)
  • Ptyas korros, Ulrich Manthey & Wolfgang Grossmann (1997)
  • Ptyas korros, Malcolm Arthur Smith (1943)
  • Zamenis korros, René Léon Bourret (1935)
  • Ptyas korros indicus, R. Mell (1931)
  • Ptyas korros chinensis, R. Mell (1930)
  • Liopeltis libertatis, Thomas Barbour (1910)
  • Zamenis korros, Frank Wall (1908)
  • Ptyas korros, Leonhard Hess Stejneger (1907)
  • Zamenis korros, George Albert Boulenger (1893)
  • Zamenis korros, George Albert Boulenger (1890)
  • Ptyas korros, Edward Drinker Cope (1861)
  • Ptyas korros, Edward Drinker Cope (1860)
  • Coryphodon korros, André Marie Constant Duméril & Gabriel Bibron (1854)
  • Coluber korros, Hermann Schlegel (1837)
Distribution map of Indo-Chinese rat snake, Ptyas korros in Thailand
  • Ban Lat District, Phetchaburi
  • Bangkok Province
  • Cha-Am District, Phetchaburi
  • Chae Hom District, Lampang
  • Chaloem Phra Kiat District, Nakhon Ratchasima
  • Doi Saket District, Chiang Mai
  • Doi Suthep-Pui National Park
  • Hang Dong District, Chiang Mai
  • Hua Hin District, Prachuap Khiri Khan
  • Huai Kha Khaeng Wildlife Sanctuary
  • Kaeng Krachan District, Phetchaburi
  • Kaeng Krachan National Park
  • Kao Liao District, Nakhon Sawan
  • Khanom District, Nakhon Si Thammarat
  • Khao Phanom District, Krabi
  • Khao Phanom Bencha National Park
  • Khao Phra - Bang Khram Wildlife Sanctuary
  • Khao Sam Roi Yot National Park
  • Khao Sok National Park
  • Khao Yai Da
  • Khao Yai National Park
  • Khuan Khanun District, Phatthalung
  • Ko Chang District, Trat
  • Ko Lanta District, Krabi
  • Ko Samui District, Surat Thani
  • Lao Khwan District, Kanchanaburi
  • Mae Rim District, Chiang Mai
  • Mu Ko Chang National Park
  • Mu Ko Samet National Park
  • Mueang Bueng Kan District, Bueng Kan
  • Mueang Chiang Mai District, Chiang Mai
  • Mueang Krabi District, Krabi
  • Mueang Nan District, Nan
  • Mueang Nongbua Lamphu District, Nong Bua Lamphu
  • Mueang Phetchaburi District, Phetchaburi
  • Mueang Phichit District, Phichit
  • Mueang Phuket District, Phuket
  • Mueang Prachuap Khiri Khan District, Prachuap Khiri Khan
  • Mueang Rayong District, Rayong
  • Mueang Tak District, Tak
  • Mueang Udon Thani District, Udon Thani
  • Na Haeo District, Loei
  • Noen Maprang District, Phitsanulok
  • Nong Kung Si District, Kalasin
  • Nong Ya Plong District, Phetchaburi
  • Pak Tho District, Ratchaburi
  • Pang Sida National Park
  • Phan District, Chiang Rai
  • Phu Luang Wildlife Sanctuary
  • Phu Toei National Park
  • Phu Wua Wildlife Sanctuary
  • Prachantakham District, Prachinburi
  • Sai Yok District, Kanchanaburi
  • Sam Phran District, Nakhon Pathom
  • Saraphi District, Chiang Mai
  • Satuek District, Buriram
  • Sawi District, Chumphon
  • Somdet District, Kalasin
  • Sri Nakarin Dam National Park
  • Sung Noen District, Nakhon Ratchasima
  • Takua Pa District, Phang Nga
  • Tha Mai District, Chanthaburi
  • Tha Song Yang District, Tak
  • Tha Yang District, Phetchaburi
  • Thalang District, Phuket
  • Thong Pha Phum District, Kanchanaburi
  • Thung Hua Chang District, Lamphun
  • Thung Yai Naresuan Wildlife Sanctuary
  • U Thong District, Suphan Buri
  • Wang Nuea District, Lampang
  • Watthana Nakhon District, Sa Kaeo

Range map of Ptyas korros in Thailand

Important note; our range maps are based on limited data we have collected. The data is not necessarily accurate or complete.

Special thanks to Ton Smits, Parinya Pawangkhanant, Ian Dugdale and many others for their contribution for range data.

It is free to use this map on various media. See the creative common license terms by clicking "CC" icon below the map. But remember, again; the map may not be accurate or complete.

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