136 



smooth scales, without pits, in i 5 or 17 rows; ventrals rounded. 

 Tail moderate; subcaudals in two rows. 

 Distribution. Borneo. 



Key to the In do -Australian species. 



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

 />. Scales in 15 rows; a single praefrontal. 



1. //. peri ops p. 136. 



2. H. pracfrontalis p. 137. 



I. Hydrablabes periops (Giinther). 



Ablabcs 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 



OrObtea. 



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



the supraocular, as long as its distance from 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. 



