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Show 846 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 posteriorly. Scales, similar to those of the belly, extend on the lower part of the hind legs, are somewhat larger, especially on the anterior 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 SceloporuB scalaris, S. graeiosuSj and Holbroohia 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. Fio. 1- 8. SPBC. CHAB.- Head subconical; 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. acalaru, consists in the marked difference 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- |