44 



CALIFORNIA ACADEMY OF SCIENCES. 



5. Dipsosaurus dorsalis ( Baird & Girard ). CRESTED 

 LIZARD. 



Crotaphytus dorsalis, BAIRD & GIRARD, Proc. Acad. Nat. Sci. Phila., 

 1852, p. 126 (type locality Desert of Colorado, Cal.). 



Dipsosaurus dorsalis, BAIRD, U. S. Mex. Bound. Surv., Ill, Kept., 

 pi. XXXII, figs. 7-13. 



Description. Head short, rounded, and rather high. 

 Nostril opening laterally in a single rounded plate which 

 is separated from the large rostral by one or two rows of 

 granules. Supraocular regions separated from each 

 other by two or three series of small convex plates and 

 covered with very small plates and granules. A large 

 subocular, followed and preceded by several smaller 

 ones. A series of long, strongly imbricate supercilia- 

 ries. Labials small, about equal in size, and from eight 



to eleven in number in each series. Symphyseal plate 

 nearly triangular and forming the base of a V-shaped 

 series of slightly enlarged plates. Gulars small, either 

 convex or flattened. Eyelids very slightly fringed. 

 Ear-opening very large, almost vertical, and with a 

 very weak anterior denticulation. Dorsal crest com- 

 posed of slightly enlarged, strongly keeled scales. 

 Other dorsals small, keeled, juxtaposed, and in series 

 which converge toward the dorsal line posteriorly. 

 Ventrals larger than dorsals and caudals, smooth and 

 imbricate. Sides covered with small granular scales. 

 Tail long, tapering, slightly crested, and with whorls of 



