( XXX vii ) 



Daboia. 

 Nostril very large. Caudals double. 

 Pattern distinctly ocellated ... D. Russellii. 



ECHIS. 



Caudals single. 

 Pattern trapezoidal ... E. carinata. 



Family CROTALIDiE. 

 Loreal region with a pit between the eye and nostril. 



Tbimeeesurus. 

 The fore part only of the head shielded. 



a. — The second upper labial forms the front margin of the 

 labial pit. 

 Scales in 17 to 19 rows. Four shields on 



the snout. Green reticulated with black 



and yellow . . . T. trigonocephalus. 



Scales in 19 to 21 rows. The supranasals 



separated by one or two plates. Green... T. gramineus. 

 Scales in 21 rows. Supranasals generally 



separated. Green with black and yeUow 



markings ... T. Anamallensis. 



Scales in 21 rows. The supranasals in con- 

 tact. Green ... T. erythrurus. 

 Scales in 2.3 rows. Supranasals in contact 



Gray, brown spotted. The last 6 sub- 



caudals entire ... T. labialis. 



Scales in 23 to 25 rows. Supranasals 



separated. Green ... T. carinatus. 



Scales in 23 (rarely 25) rows. Supranasals 



separated. Brown, black spotted ... T. monticola. 



Scales in 25 rows. Supranasals separated 



by a latrge shield. Dull green, with 



indistinct porphyraceous spots ... T. porphyraceus. 



