Thai National Parks

Reptiles of Thailand

Species of Thailand

Indochinese rat snake

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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Videos of Indochinese rat snake

  • Ptyas korros

    Ptyas korros

Scientific classification

Ptyas korros

Common names

  • German: Indochinesische Rattenschlange, Indomalayische Rattenschlange
  • English: Chinese ratsnake, Indo-Chinese rat snake
  • Thai: งูสิงบ้าน (Ngu Sing Baan)


  • 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)

Indochinese rat snake is found in following locations in Thailand

Please note that this non-official list is not complete nor necessarily accurate. This list is a summary of checklists from other websites, blogs, publications, photo/videos published on various websites or our own findings. We appreciate your contributions with photo proof.

Distribution map of Indochinese rat snake, Ptyas korros in Thailand

Range map of Ptyas korros in Thailand

Important note; our range maps are generated automatically based on very limited data we have about the protected sites, the data is not necessarily accurate. Please help us to improve our range maps by sharing your findings/knowledge.