296 COLTJBBID^. 



contact with, the anterior chin-shields, which are in contact with the 

 mental ; posterior chin-shields short. Scales in 17 rows, rather 

 feehly keeled, outer row smooth or faintly keeled. Ventrals 130- 

 138; anal entire; subcaudals 36-42. Blackish above ; a yellowish 

 band crosses the temples and parietals ; lower parts yellowish white, 

 spotted or dotted with black. 



Total length 285 miUim. ; tail 48. 



Mexico and Guatemala. 



a. e (V. 138; C. 36). Huatuzco, Mexico. F. D. Godman & 0. Sal- 



vin, Esqrs. [P.]. 



23. HYDRABLABES. 



Hydrablabes, Boulmg. Ann. ^ Mag. N. H. (6) vii. 1891, p. 343. 



Maxillary teeth small, equal, about 18 ; mandibular teeth 

 small, equal. Head small, not distinct from neck; eye small, 

 with round pupil ; nostril valvular, an oblique slit between two 

 nasals ; three pairs of chin-shields. Body cylindrical, elongate ; 

 scales smooth, without apical pits, in 15 or 17 rows ; ventrals 

 rounded. Tail moderate, subcaudals in two rows. Hypapophyses 

 developed throughout the vertebral column. 



Borneo. 



1. Hydrablabes periops. 



Ablabes periops, Oiinth. Proc. Zool. 8oc. 1872, p. 596, fig. 

 Hydrablabes periops, Bouleng. Arm. ^ Mag. N. H. (6) vii. 1891, 

 p. 344. 



Snout short and broad, not projecting. Eostral much broader 

 than deep, just visible from above ; internasals not half as large as 

 the prefrontals, usually forming a suture with the loreal ; frontal 

 nearly as broad as long, more than twice as broad as the supra- 

 ocular, as long as its distance from the end of the snout, much 

 shorter than the parietals ; loreal longer than deep ; two prse-, two 

 post-, and two or three suboculars, the eye completely separated 

 from the labials; temporals 14-2; eight or nine upper labials; 

 three pairs of chin-shields, second largest and separating the third. 

 Scales in 17 rows. Ventrals 190-209, the last divided; anal 

 divided ; subcaudals 62-74. Olive-brown above, with a more or 

 less distinct yellowish streak along each side of the body anteriorly ; 

 sides blackish ; ventrals whitish, edged with blackish ; subcaudals 

 blackish, edged with whitish. 



Total length 450 millim. ; tail 95. 



Borneo. 



a-h. S (V. 209 ; C. 62) Matang. (Types.) 



& yg. (V. 204 ; 0. 74), 

 c. S (V. 190; 0.70). Matang. 



