( XXXV ) 



Python, 



The anterior portion only of the crown covered with symme- 

 trical shields. 

 A black median line from the rostral to 



neck ... P. reticulatus. 



A brown lanceolate spot on the crown and 



nape ... P. molurus. 



Family ERYCID^. 



Tail short. Caudals entire. In adults a short conical promi- 

 nence in a groove on each side of the vent. 



CURSORIA. 

 Scales smooth. 

 Scales smooth. A pair of small frontals . . . C. elegans. 



GONGYLOPHIS. 

 Scales keeled. Mental groove none. 

 A dorsal series of quadrangular blotches. No 



mental groove ... G. conicua. 



Eryx. 



Scales keeled. Mental groove present. 

 Adult reddish brown. A mental groove. 



Scales keeled ... E. Johnii. 



II.— SUB-ORDER POISONOUS COLUBRINE SNAKES. 

 A poison gland present. A short grooved non-erectile poison 

 fang. 



Family ELAPID^E. 

 Tail conical. Terrestrial. Pupil round. Loreal none. 



Naija. 



Neck more or less dilatable. Scales smooth in 15 rows on th© 

 body. 



A well marked hood on the neck ' ... N. tripudians. 



No hood. Some caudals undivided . . . N. cla 



