476 ME. G. A. BOULENGER ON THE [May 18, 



jS. The distance between the base of the fifth toe and the extremity of 

 the fourth less than that between the nostril and the arm. 



# Dorsal scales feebly keeled, not or but shortly mucronate, 30-35 

 between the interparietal shield and the base of the tail, 6-7 

 corresponding to the length of the shielded part of the head ; 

 tibia longer than the shielded part of the head. 



9. S. orciitti, Stejn. 



*# Dorsal scales strongly keeled and mucronate, not more than 45 

 between the interparietal shield and the base of the tail. 



t 25-32 scales between the interparietal shield and the base of 

 the tail, 5-7 corresponding to the length of the shielded part 

 of the head. 



I Tibia not or but little longer than the shielded part of the 



head. 



Dorsal scales moderately or strongly mucronate ; femoral pores 2- IC on each 



side 10. S. sphiosus,Wiegm. 



Dorsal scales very strongly mucronate ; femoral pores 13-17. 



11. S. (wanihinus, Bocourt. 

 Dorsal scales strongly mucronate, forming more or less oblique series con- 

 verging towards the middle line; femoral pores 17-21. 



12. S. asper, Blgr. 



II Tibia about one-fourth longer than the shielded part of the 



head ; femoral pores 17-22 on each side. 



13. 8. eosteromus, Cope. 



tt 32-45 scales between the interparietal shield and the base of 

 the tail, 7-10 corresponding to the length of the shielded 

 part of the head. 



Upper head-shields smooth ; dorsal scales very strongly mucronate and denti- 

 culate ; tibia longer than the shielded part of the head ; scales on back of 

 thighs large 14. S. ^«>Xm, Van Denb. 



Upper head-shields smooth ; dorsal scales moderately or shortly mucronate ; 

 tibia as long as or slightly longer than the shielded part of the head. 



15. S.formosiis, Wiegm. 



Upper head-shields more or less distinctly rugose, rarely smooth ; dorsal scales 

 rather sti'ongly mucronate ; tibia as long as or longer than the shielded part 

 of the head 16. S. tindulaius, Dsiud. 



**» 46-56 scales between the interparietal shield and the base of 

 the tail. 



Dorsal scales rather feebly keeled, forming parallel longitudinal series, 47-51 

 between interparietal shield and base of tail, 9-11 corresponding to the length 

 of the shielded part of the head 17. S. elonffatus, Stejn. 



Dorsal scales strongly keeled, forming parallel longitudinal series, 52-56 between 

 interparietal shield and base of tail, 11-16 corresponding to the length of 

 the shielded part of the head 18. S. ffraiiosus, B. & Ot. 



Dorsal scales strongly keeled, forming oblique series converging towards the 

 middle line, 46-50 between interparietal shield and base of tail, 12-15 corre- 

 sponding to the length of the shielded part of the head. 



19. S. grammicus, Wiegm. 



##«# 60-83 scales between the interparietal shield and the base 

 of the tail, strongly keeled, forming oblique series converging 

 towards the median line, 12-20 corresponding to the length of 

 the shielded part of the head... 20. 8. microlepidotus, Wiegm. 



h. Dorsal scales very unequal in size ... 21. 8. heterolepis, Blgr. 



