( xxxiv ) 



Tetragonosoma. 



Loreal none. Two nasals. 



Loreal none. Purple, marbled with black 



and white ... T. atropurpureura, 



6. — Scales keeled or grooved. 



Ophites. 



Scales in 17 rows. 

 Pale reddish with 50 brown cross bands ... O. albofuscus. 

 Two yellow dots on each scale ... 0. jara. 



Cercaspis. 



Scales in 17 to 19 rows. Subcaudals entire. 

 Colour black, encircled with white rings ... C. carinata. 

 Colour black with white bars ... C. Travankorica, 



Family AMBLYCEPHALIDiE. 



Body slender, compressed. Head short, distinct. Nasal on^. 

 Mandible not expansile. 



Pareas. 

 Caudals bifid. 

 Loreal none. A small lower prseocular ... P. monticola. 

 Loreal none. One large prseocular ... P. Igevis. 



Loreal small ... P. margaritophorus. 



Loreal moderate. Two small prseoculars ... P. modestus. 



Family XENOPELTID^. 

 Occiput covered by five shields. Eye small. 



Xenopeltis. 



Scales lustrous, smooth in 15 rows. 

 5 occipitals. Loreal none ... X. unicolor. 



Family PYTHONID^. 



Large snakes with a spur-like prominence in adults, indicating 

 an aborted pelvic limb, on each side of the vent. 



