136 



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

 Tail moderate; subcaudals in two rows. 

 Distribution. Borneo. 



Key to the In do -Australian species. 



.4. Scales in 17 rows; two praefrontals . . . . 

 B. Scales in 15 rows: a single praefrontal. . 



. I. //. pcriops p. 136. 



. 2. H. pracfrontalis p. 137. 



I. Hydrablabes periops (Giinther). 



Ablabes periops^ Giinther, Proc. Zool. Soc. 1872, p. 595, fig. 3. 

 Hydrablabes periops^ Boulenger, Cat. Sn. I 1893, p. 296. 



Snout short and broad; rostral just visible from above; 

 internasals not half as large as the praefrontals, usually in 

 contact with the loreal; frontal more than twice as broad as 



Fig- 55- Hydrablabes periops (Gthr.). Nat. size. Side view of head. 



the supraocular, as long as its distance fi'om the tip of the 

 snout, much shorter than the parietals; loreal more long than 

 deep; two prae-, two post- and two or three suboculars; tem- 

 porals 1+2; eight or nine upper labials, all separated from 

 the eye; three pair of chin-shields, second largest and sepa- 

 rating the third. Scales in 17 rows; ventrals 190 — 209, the 

 last divided; anal divided; subcaudals 62 — 74. 



