406 S AURI A. 



side of the neck, with a middle light zone between, extends from the 

 occiput to the shoulders. Three pairs of similar patches may be ob- 

 served along the dorsal region, the patches of the anterior pair nearly 

 circular, and surrounded as they are by a light margin, they assumed 

 an ocellated aspect. The patches of the two remaining pairs being 

 undulated, their posterior light margin resemble an acute triangle. 

 Five or six transverse black fasciae are to be observed along the sur- 

 face of the tail: The rest of the upper surface is clouded with brown- 

 ish. The limbs are barred and clouded like the tail. The inferior 

 surface of the body is sometimes unicolor, at others clouded with 

 greyish, or else distinctly maculated. 



VLoc. — Southwestern States of the Union. 



Plate XXI, fig. 6, represents the female sex of Phrynosoma cornu- 

 tum, in profile, and size of life. 

 Fig. 7, is a dorsal view, and. 



Fig. 8, a view from beneath, of the same individual. 

 Fig. 9, exhibits a front view of the head. 



2. Phktnosoma regale, Grd. 



Spec. Char. — Vertex and occipital regions quite depressed. Temporal 

 and occipital spines flat and acute, constituting a continuous series, 

 very much inclined backwards. Labial plates proportionally well 

 developed, unequal, and rugose. Scales under the chin small, 

 rounded, subconvex; largest series subpyramidal and acuminated. 

 Pectoral scales moderate, and acuminated also. Lower series of sub- 

 pyramidal scales at the periphery of the abdomen, obsoletely deve- 

 loped. Abdominal scales subrhombic, not acuminated, and slightly, 

 though distinctly, carinated. Femoral pores small, and closely set 

 together ; the series from either side, not continuous on the inter- 

 femoral region, over which they somewhat extend. Postanal scales 

 very minute. Ground color brownish-olive above, back, limbs, and 

 tail transversely maculated with black; beneath yellowish, with 

 small black spots on the middle of abdomen. 



Observ. — A most characteristic species, not only by the disposition 

 of the temporal and occipital spines upon the same plane, but likewise 



