Species of Thailand

Indo-Chinese rat snake

Ptyas korros, Hermann Schlegel, 1837

(In Thai: งูสิงธรรมดา, ngu sing tammada)

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)
  • Ptyas korros, Merel J. Cox et al. (1998)
  • Coluber korros, James Draper Lazell (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)

Range Map

Distribution map of Indo-Chinese rat snake, Ptyas korros in Thailand
  • Ban Chang District, Rayong
  • Ban Lat District, Phetchaburi
  • Bang Lamung District, Chonburi
  • Bang Phli District, Samut Prakan
  • Bang Saphan Noi District, Prachuap Khiri Khan
  • Bangkok Province
  • Betong District, Yala
  • Bueng Bun District, Sisaket
  • Cha-Am District, Phetchaburi
  • Chae Hom District, Lampang
  • Chaloem Phra Kiat District, Nakhon Ratchasima
  • Chiang Kham District, Phayao
  • Chiang Saen District, Chiang Rai
  • Dan Chang District, Suphan Buri
  • Doi Phu Kha National Park
  • Doi Saket District, Chiang Mai
  • Doi Suthep - Pui National Park
  • Fang District, Chiang Mai
  • Hang Chat District, Lampang
  • Hang Dong District, Chiang Mai
  • Hua Hin District, Prachuap Khiri Khan
  • Huai Kha Khaeng Wildlife Sanctuary
  • Huai Yot District, Trang
  • Kaeng Krachan District, Phetchaburi
  • Kaeng Krachan National Park
  • Kantharawichai District, Maha Sarakham
  • Kao Liao District, Nakhon Sawan
  • Khanom District, Nakhon Si Thammarat
  • Khao Nam Khang National Park
  • 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
  • Khlong Phanom National Park
  • Khuan Khanun District, Phatthalung
  • Khun Yuam District, Mae Hong Son
  • Ko Chang District, Trat
  • Ko Lanta District, Krabi
  • Ko Mak
  • Ko Samui District, Surat Thani
  • La-un District, Ranong
  • Lao Khwan District, Kanchanaburi
  • Lat Phrao District, Bangkok
  • Li District, Lamphun
  • Mae Rim District, Chiang Mai
  • Mae Wang District, Chiang Mai
  • Manang District, Satun
  • Mu Ko Chang National Park
  • Mu Ko Samet National Park
  • Mueang Bueng Kan District, Bueng Kan
  • Mueang Chiang Mai District, Chiang Mai
  • Mueang Kanchanaburi District, Kanchanaburi
  • Mueang Krabi District, Krabi
  • Mueang Lampang District, Lampang
  • Mueang Nakhon Ratchasima District, Nakhon Ratchasima
  • 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 Songkhla District, Songkhla
  • Mueang Surat Thani District, Surat Thani
  • Mueang Tak District, Tak
  • Mueang Trang District, Trang
  • Mueang Udon Thani District, Udon Thani
  • Na Haeo District, Loei
  • Na Yong District, Trang
  • Noen Maprang District, Phitsanulok
  • Non Sung District, Nakhon Ratchasima
  • Nong Ki District, Buriram
  • Nong Kung Si District, Kalasin
  • Nong Ya Plong District, Phetchaburi
  • Nopphitam District, Nakhon Si Thammarat
  • Pa Phayom District, Phatthalung
  • Pak Phanang District, Nakhon Si Thammarat
  • Pak Tho District, Ratchaburi
  • Palian District, Trang
  • Pang Sida National Park
  • Phan District, Chiang Rai
  • Phen District, Udon Thani
  • Phimai District, Nakhon Ratchasima
  • Phu Khiao District, Chaiyaphum
  • Phu Luang Wildlife Sanctuary
  • Phu Toei National Park
  • Phu Wua Wildlife Sanctuary
  • Prachantakham District, Prachinburi
  • Pran Buri District, Prachuap Khiri Khan
  • Sai Yok District, Kanchanaburi
  • Sam Phran District, Nakhon Pathom
  • Saphan Sung District, Bangkok
  • Saraphi District, Chiang Mai
  • Sathing Phra District, Songkhla
  • Satuek District, Buriram
  • Sawi District, Chumphon
  • Selaphum District, Roi Et
  • Somdet District, Kalasin
  • Sri Nakarin Dam National Park
  • Suan Luang District, Bangkok
  • Sung Noen District, Nakhon Ratchasima
  • Takua Pa District, Phang Nga
  • Tha Mai District, Chanthaburi
  • Tha Song Yang District, Tak
  • Tha Takiap District, Chachoengsao
  • Tha Yang District, Phetchaburi
  • Thalang District, Phuket
  • Thong Pha Phum District, Kanchanaburi
  • Thung Hua Chang District, Lamphun
  • Thung Song District, Nakhon Si Thammarat
  • Thung Wa District, Satun
  • 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