iSS COLUBRIK^. 



Subfamily HOMALOPSIN^. 



Synopsis of the Genera. 



I. Nasals in contact above the rostral. 

 Scales smooth ; parietal shields well developed. IIypsibhina, p. 158. 



Scales keeled ; parietals well developed Homalopsis, p. 162. 



Scales keeled ; parietals more or less broken up 

 into scales Cerberus, p. 163. 



II. Nasals separated by an internasal ; scales 

 smooth. 

 Loreal absent ; parietals well developed ; body 



stout ; ventrals large, not keeled Fordonia, p. 164. 



Loreal present ; parietals well developed ; body 



extremely elongate ; ventrals large, not keeled. Cantoria, p. 165. 

 Loreal present ; parietals broken up into scales ; 



ventrals very narrow, bicarinate Hipistes, p. 166. 



The suakes o£ this subfamily are thoroughly aquatic and vivi- 

 parous. 



Genus HYPSIRHINA. 

 Wagl. Syst. Amph. p. 169 (1830). 



Maxillary teeth 10-1 G, followed, after an interspace, by a pair 

 of enlarged, grooved fangs ; anterior mandibular teeth longest. 

 Head small, not or but slightly distinct from neck ; eye small, 

 with round or vertically elliptic pupil ; head-shields large ; nasals 

 in contact behind the rostral, semidivided, the cleft extending 

 from the nostril to the first labial or the loreal ; internasal single or 

 divided ; loreal present. Body cylindrical ; scales smooth, without 

 pits, in 19 to 33 rows ; ventrals rounded. Tail moderate or short ; 

 subcaudals in two rows. 



South-Eastern Asia, Papuasia, Northern Australia. 



Pive species have been found in the Malay Peninsula. 



Synojpsis of the Species. 

 I. Scales in 19 rows. 



"Ventrals 173-175 ; two internasals H. indica, p. 159. 



Ventrals 117-139 ; a single nasal (rarely divided). H. plwitbea, p. IGO. 



II. Scales in 21 rows or more. 



Scales in 21 or 23 rows; a single internasal .... H. enhi/dris, p. 160. 



Scales in 27 rows ; a single internasal H. bocourti, p. 161. 



Scales in 29-33 rows ; two interjiasals II. siebohUi, p. 161. 



