346 APPENDIX C. — REPTILES. 



ceed three or four conical and acute scales ; the posterior pectoral 

 fold is provided along its margin with a row of large, smooth, and 

 subquadrangular scales. The anterior and upper surface of the 

 locomotive members are covered with scales nearly of the same 

 size of those of the belly, but carinated and a little narrower pos- 

 teriorly. Scales, similar to those of the belly, extend on the lower 

 part of the hind legs, are somewhat larger, especially on the an- 

 terior margin. The toes are slender and terminated by short, 

 pointed, and slightly recurved nails. The small scales which cover 

 the middle region of the back, from the anterior limbs to the 

 origin of the tail, are somewhat longer than those of the occiput 

 and sides from the ear to the hind limbs. The posterior part of the 

 thigh and groins are covered with minute scales similar to those 

 of the sides of the body. The largest scales are seen on the tail, 

 as already observed ; they are verticillated and strongly carinated. 



The colour below is uniform greenish-yellow, except under the 

 head, where the green predominates, intermingled with brownish, 

 narrow bands. Above it is blackish-brown, marbled with greenish- 

 yellow, or whitish-yellow irregular dots. Sometimes a double row 

 of dorsal patches of a deeper black may be seen along the back in 

 some individuals, recalling to mind a similar distribution of colour 

 in Sceloporus scalaris, S. graciosus, and Holhrookia maculata. 



This species is from the valley of the Great Salt Lake, where it 

 was collected by Captain Howard Stansbury ; in remembrance of 

 whose services to the country and to science we have designated 

 it under the name which it now bears. 



Sceloporus graciosus, Baird and Girard. 



Pl. v. Fig. 1-3. 



Spec. chab,. — Head subcorneal ; scales of the back proportionally large ; tail of 



medium size, slender and conical. 



This small and graceful species has a much greater affinity with 

 the Mexican Sceloporus scalaris than with S. undulatus of the 

 United States. The most striking character, as compared with S. 

 scalaris, consists in the marked diiOference in size between the 

 scales of the back and those of the base of the tail. The latter is 

 proportionally longer than in S. scalaris, and shorter than in S, 

 undulatus. The body of our species is subcylindrical, and rather 

 short ; the specimen figured being a female, the abdomen is repre- 



