1897.] LIZARDS OF THE GENUS SCELOPOEUS. 475 



Synopsis of the Species. 



I. Lateral scales directed obliquely upwards and backwards, and passing 

 gradually into the dorsals ; series of femoral pores usually widely sepa- 

 rated, not meeting on the pr»anal region. 



A. Tail cylindrical ; hind limb not reaching the eye ; head-shields smooth or 

 slightly rugose. 



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



fourth not exceeding the distance between the end of the snout and 

 the ear ; tibia nearly as long as, or a little shorter than, the shielded 

 part of the head; 26-39 scales between the interparietal shield and 

 the base of the tail. 



a. None of the enlarged supraoculars in contact with the shields of the 



crown. 



27-37 scales between the interparietal shield and the base of the tail, 5-7 corre- 

 sponding to the length of the shielded part of the head, forming parallel 

 series on the back I. S. torqiia(us,'W\egm. 



33-39 scales between the interparietal shield and the base of the tail, 8-9 corre- 

 sponding to the length of the shielded part of the head, forming oblique 

 series converging towards the median line of the back. 



2. S. bulleri, Blgr. 



b. Fourth supraocular in contact with the parietal shields ; 26-27 scales 



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

 sponding to the length of the shielded part of the head, forming 

 parallel series on the back 3. S. melanorhimcs,'Bocoart. 



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



fourth not or but slightly exceeding the distance between the end of 

 the snout and the posterior border of the ear ; 38-64 feebly keeled 

 scales between the interparietal shield and the base of the tail. 



a. Dorsal scales forming parallel longitudinal series. 



38-46 scales between the interparietal shield and the base of the tail, 8-11 corre- 

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



4. S. yarrovii, Cope. 



60-64 scales between the interparietal shield and the base of the tail, 15-16 

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



5. S. ornatus, Baird. 



h. Dorsal scales forming oblique series converging towards the middle 

 line posteriorly, 44-48 between the interparietal shield and the base 

 of the tail, 9-10 corresponding to the lengtli of the shielded part of 

 the head 6. S. dugesii, ^oconrt. 



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



fourth equalling or somewhat exceeding the distance between the end of 

 the snout and the posterior border of the ear ; dorsal scales strongly 

 keeled, slightly mucronate, 38-47 between the interparietal shield and 

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

 part of the head ; tibia slightly shorter than the shielded part of the 

 head 7. S. consobrinus, B. & Gr. 



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



fourth exceeding the distance between the end of the snout and the 

 posterior border of the ear. 



a. Dorsal scales equal in size. 



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

 the fourth equalling the distance between the nostril and the 

 arm ; 35 strongly keeled and strongly mucronate scales between 

 the interparietal shield and the base of the tail, 10 corresponding 

 to the length of the shielded part of the head. 



8, S. serrifer. Cope. 



