Thai National Parks

Reptiles of Thailand

Species of Thailand

White-bellied rat snake

Thai: งูสิงใต้, ngu sing dtai

Binomial name: Ptyas fusca, Albert Charles Lewis Günther, 1858

Ptyas fusca, commonly known as the White-bellied Rat Snake or Brown Rat Snake, is a species of colubrid snake. It is found in Indonesia, Brunei, Malaysia, Thailand and Singapore.

The White-bellied Rat Snake prefers forested habitats.They are known to prey on frogs and lizards and fish. It is known to remain still and hold neck erect when disturbed-a threatening posture.

The adults range from brown to brick-red colour on the upper surface. Ventral scales are white to pale yellowish in colour. Thick black stripes on either side of the posterior body and tail is a characteristic feature. Juveniles often greenish in coloration. The pupil is rounded and large.

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Scientific classification

Ptyas fusca

Common names

  • German: Braune Rattenschlange
  • English:
    • White-bellied rat snake
    • Brown rat snake
  • Thai:
    • งูสิงใต้, ngu sing dtai
    • งูสิงทอง, ngu sing thong


  • Ptyas fusca, Van Stanley Bartholomew Wallach et al. (2014)
  • Ptyas fusca, Patrick David & Indraneil Das (2004)
  • Ptyas fuscus, Rudolf Malkmus et al. (2002)
  • Ptyas fuscus, Merel J. Cox et al. (1998)
  • Ptyas fuscus, Patrick David & Gernot Vogel (1996)
  • Zaocys fuscus, Ulrich Manthey (1983)
  • Zaocys fuscusv, Ulrich Manthey (1983)
  • Zaocys fuscus, Alice Georgie Cruickshank Grandison (1978)
  • Ptyas fuscus, Frank Wall (1923)
  • Zaocys fuscus, George Albert Boulenger (1893)
  • Zaocys (Zapyrus) fuscus, Oskar Boettger (1887)
  • Zapyrus fuscus, George Albert Boulenger (1885)
  • Zaocys fuscus, Albert Charles Lewis Günther (1864)
  • Coryphodon fuscus, Albert Charles Lewis Günther (1858)

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)

Distribution map of White-bellied rat snake, Ptyas fusca in Thailand

Range map of Ptyas fusca 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.

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