27? 



the eye; no praeocular; two postoculars; temporals 2 -f 2, 

 sometimes the two upper fused; seven upper labials; third and 

 fourth entering the eye, last large; mental in contact with a 

 small azygous shield; second or third lower labial usually in 

 contact with its fellow; two pair of large chin-shields, more 

 broad than long. Scales in 15 rows, smooth, three median rows 

 enlarged; ventrals 154 — 170; anal entire; subcaudals 26 — 55. 



Pale brown or yellowish above, with irregular dark trans- 

 verse bars, sometimes interrupted on the vertebral line; median 

 dorsal scales yellowish; head sometimes light; sides of neck 

 black. Lower surface whitish, sometimes speckled with brown; 

 neck black below. Length of head and body 390 mm.; tail 50 mm. 



Habitat: Mentawei Islands (Siberut !); Sumatra (Deli!, Kaju 

 tanam!, Indragiri, Benakat in Palembang); Borneo (Bongon, 

 Mt. Dulit, Sarawak, Samarinda!). — Malay Peninsula. 



3. Amblycephalus nuchalis Boulenger. 



Aviblycephahis nuchalis^ Boulenger, Proc. Zool. Soc. 1900, p. 185, pi. XVII, fig. i. 



Rostral as broad as deep; praefrontal entering the eye; 

 frontal one time and two thirds as long as broad, twice as 

 long as its distance from the tip of the snout, one time and 

 a half as long as the parietals; two praeoculars; two postoculars; 

 three narrow suboculars; three superposed anterior temporals; 

 a pair of nuchals; eight upper labials, last very long; first lower 

 labial in contact behind the mental; three pair of large chin- 

 shields, first more broad than long. Body strongly compressed; 

 scales in 15 rows, dorsals feebly keeled; the enlarged vertebrals 

 bicarinate; ventrals 195 — 213; anal entire; subcaudals 105 — 113. 



Pale buff, with narrow brown transverse lines and dark 

 dots; a large black blotch on the nape with a black line on 

 each side of the eye; a black vertical line below the eye and 

 on the temple. Length of head and body 365 mm,; tail 125 mm. 



Habitat: Borneo (Matang, Saribas!). 



4. Amblycephalus carinatus Boie. 



Aiitblycephalits carinatus^ Boie, Isis, 1828, p. 1 03 5. 



Amblycephalus carinatus^ Boulenger, Cat. Sn. Ill 1896, p. 445 (s. syn.). 



Rostral more deep than broad; praefrontal separated from 

 the eye; frontal as long as broad or a little more long, longer than 

 its distance from the tip of the snout, as long as or a little 



