( xxiii ) 



Family CALAMARID^. 

 Snakes of small or moderate size, with some of the head shields 

 united. Loreal none. 



Calamahia. 

 One pair of fix»ntals. Four or five upper labials. 

 11 Black lines down the back ... C. Siamensia. 



4 black lines down the back ... C. catenata. 



Macrocalamus. 

 One pair of frontals. Eight upper labials. M. lateralis. 



Blythea. 



Two pair of frontals. Six upper labials. Anal bifid. 

 Colour black ... B. reticulata. 



Geophis. 



Two pair of frontals. Five or six upper labials. Anal entire. 

 3 rows of dark spots down the back ... G. microcephalus. 



ASPIDURA. 

 One anterior frontal. 

 Belly white ... A. brachyorros. 



Belly marked with black ... A. trachyprocta. 



No prsecular. Belly marked with black ... A. Copii. 

 BeUy duU yellowish, immaculate ... A. Cylonensis. 



Family OLIGODONTID^. 



Head not distinct from neck. Maxillary teeth few, the last 

 enlarged, not grooved. Rostral large, extended backwards. 

 Pupil round. 



Trachischium. 



Scales in 13 rows, granulosely keeled in theischiatic region only. 

 Colour brownish black, obscurely pale 

 streak ... T. fuscum. 



