49. scELoroRTJS. 217 



a. Dorsal scales forming parallel longitudinal lines. 

 a. Occipital broader than the parietals. 



* Less than 50 scales on the middle of the back between 

 the occipital shield and the base of the tail. 



t The distance between the fifth toe and the ex- 

 tremity of the fourth not exceeding that between 

 the end of the snout and the posterior border of 

 the ear. 



Less than 40 scales on a line between occipital 



and tail ; 5 to 7 dorsal scales correspond 



to the length of the shielded part of the 



head 1. torquatus, p. 219. 



More than 40 scales between occipital and 



tail; 9 or 10 correspond to the length of [p. 229. 



the shielded part of the head 12. consobrinus, 



tt The distance between the fifth toe and the ex- 

 tremity of the fourth exceeds that between the 

 end of the snout and the posterior border of the 

 ear. 



J More than 30 scales between the occipital and 

 the base of the tail ; 7 to 10 scales correspond 

 to the length of the shielded part of the head. 



Dorsal scales strongly keeled and mucronate; 



head-shields constantly smooth 4. formosus, p. 222. 



Dorsal scales strongly keeled, moderately or 

 shortly mucronate ; head-shields fre- 

 quently rugose or striated 11. undidahis, p. 227. 



Dorsal scales weakly keeled, shortly mucro- 

 nate ; head-shields smooth 5. yarrovii, p. 223. 



+X Nt)t more than 30 scales between the occipital 

 and the tail ; 5 or 6 scales correspond to the 

 length of the shielded part of the head. 



Tibia as long as the shielded part of the 



head 3. acanihinus, p. 221 . 



Tibia longer than the shielded part of the 



head 10. spinosus, p. 226. 



** 50 or more scales between the occipital and the tail. 



Dorsal scales in about 64 transverse series, 



with but slight carination, mucronation 



and dcnticulation G. oniatas, p. 224. 



Dorsal scales in 50 to 56 transverse series, 



simply pointed, not denticulated 13. f/mtiosus, p. 230. 



Dorsal scales in about 80 transverse series . 14. couc7d?\ p. 231. 



