296 COLUBRID, 
contact with the anterior chin-shields, which are in contact with the 
mental; posterior chin-shields short. Scales in 17 rows, rather 
feebly keeled, outer row smooth or faintly keeled. Ventrals 180- 
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 millim.; tail 48, 
Mexico and Guatemala, 
a. o (V. 188; ©. 36). Huatuzco, Mexico. F. D. Godman & O, Sal- 
vin, Esqrs. [P.}. 
23. HYDRABLABES. 
Hydrablahbes, Bouleng. Ann. § Mag. N. H. (6) vii. 1891, p. 348. 
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, Giinth. Proc. Zool. Soc. 1872, p. 595, fig. 
ayapisles periops, Bouleng. Ann. § Mag. N. H. (6) vii. 1891, 
p. 344. 
Snout short and broad, not projecting. Rostral 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 pree-, two 
post-, and two or three suboculars, the eye completely separated 
from the labials; temporals 1+ 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; subcaud 
blackish, edged with whitish. be 
Total length 450 millim.; tail 95. 
Borneo, 
a-b, 3 (V. 209; C. 62) Matang. (Types.) 
& yg. (V. 204; ©. 74). 
e. d (V. 190; C. 70). Matang. 
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