Homalopsidae-Check list snakes northern Thailand

Homalopsidae, the family of mud snakes

• Enhydris bocourti

Enhydris enhydris, the Rainbow Water Snake. This mud snake can reach a length of 90 cm. The small head is hardly distinct from the neck (A). The dorsum is brown with vague pale stripes (A, A1, C). In the second row of dorsals on the flanks the scales are orange-brown (A2). It is common in swamps, inundated paddies and ditches in the Lower North (such as Nakhon Sawan and Uthai Thani provinces) but seems to be absent in the Upper North. A. Adult from Nakhon Thai District, Phitsanulok. A1. Dorsal skin of specimen from xxx. A2. Ventral pattern of specimen from Mueang Chaiyaphum. B. Captive specimen, Snake Farm, Bangkok. C. Specimen from Lom Sak District, Phetchabun.

Enhydris jagorii
(no picture), Jagor’s Water Snake.

Enhydris subtaeniatus, the Mekong Mud Snake (above). This mud snake is very similar to Enhydris enhydris, but distinguishes itself by a series dark dots on the flanks. A. Spotted flanks of a specimen from Khon San District, Chaiyaphum. B. A specimen from Nong Bua Daeng District, Chauyaphum. It is best known from the northeastern region but also occurs in the eastern parts of the northern region (Uttaradit Province)

xxxxx plumbea, the Yellow-bellied or Plumbeous Water Snake. Little snake (max. length 60 cm) common in well-watered lowlands throughout the northern region. Upper side brownish or greenish-bronze. Belly pale yellow or dark yellow. A. A specimen from Mueang District, Chiang Mai. B. DOR-specimen from Loei Province, Northeast-Thailand. C. An adult specimen from Mueang Chiang Mai preying on a frog.

Homalopsis mereljcoxi, the Puff-faced Water Snake. These brown or dark grey snakes can grow to about 100 cm. They have many irregularly-shaped lighter crossbars (A, C, D). The pattern on the upper side of the head resembles a human skull (E). The belly is white with widely spaced black dots in the corners of the ventral shields. It occurs in marshlands, ditches, and wet rice fields in the southern part of the northern region. A. DOR from a swamp in Uttaradit’s Phichai District. B. Ventral view of the same specimen as in A. C. A tangle of (young) specimens in a basin in Bangkok’s Snake Farm. D. An captive individual in the Mae Rim Snake Farm, Chiang Mai. E. Head of the specimen in D.