CROCODILIANS, LIZARDS, AND SNAKES. 



285 



distal third, four black spots. The anterior is round, and the others 

 increase in length to the fourth, which is elongate. 



This species, the most peculiarly marked lizard of North America, 

 differs in numerous respects from its congener, the Uma notata, with 

 which I at one time identified it. Thus, the number of femoral pores is 

 more than twice as great; the labial plates are keeled; the digits and 

 claws are shorter, and the latter are not excavated fartln^r proximally ; 

 the transition from the small to the large scales of the humerus and 

 femur is gradual and not abrupt; the fringes of the borders of the eye- 

 lids are of equal length, the inferior not being longer, as in U. notata; 

 and finally, the fringes of the digits and sole are longer in the U. 

 acoparia than in the U. no fata. 



Uma scoparia Cope. 



HOLBROOKIA Girard. 



Solbrookia Girard, Proc. Amer. Ass. Ad. Sci., IV, 1851, p. 201 ; Stausbiiry's Exp. 

 Gr. Salt Lake, 1852, p. 341.— A. Dumeril, Arcb. Mus., VIII, 1856, p. 545.— 

 BocouRT, Miss. Sc. Mex., Kept., 1874, p. 160. — Boulenger, Cat. Liz. Brit. 

 Mus., VII, 1885, p. 207. 



Cophosaurus Troschel, Arch. f. Nat., 1850, [issued 1852], p. 389. 



A gular fold of large scales, sides of neck variously plaited. Scales 

 above and on sides small, nearly even, considerably less than the ven- 

 tral, all rhomboidal, imbricated. Tail moderate, not brittle. Femoral 

 pores distinct. Ko external ear. Nostrils superolateral, anterior to 

 the end of the canthus rostralis. A large infraorbital plate. Upper 

 labials very oblique, imbricated. Head plates, including interparietal, 

 small. Tongue barely notched at tip, with two sessile subtriangular 

 pallets beneath. No palatines. Cheek teeth conical, posterior only 

 faintly tricuspid. 



This genus has a distribution throughout the Sonoran district extend- 

 ing nearly to Oregon on the north, and entering the Central district as 

 far as Kansas inclusive. It is abunxlant in Texas, but is wanting from 

 the Pacific and Lower Californian districts, where its i)lace is suiJidied 

 by Callisaurus. The species are not numerous, and are as follows: 



I. Tail llattcued, longer than bead and body. Frontal seales larger than supraor- 

 bitals; postiufralabials few. 

 Hind foot oue-balf length of body; tail with black spots below; male with 



black crescents ou the sides H. Iciana. 



II. Tail cylindric, longer than head and body. Frontal scales smaller than supra- 

 orbitals; i)ostinfralabials many. 

 Hind foot three-fifths length of body; no spots on under surfact; of tail; sides 

 with oblique black 8i)()ts; scales minute H. jn'opinqua. 



