146 PROCEEDINGS OF THE ACADEMY OF [1885. 



of pyramidal scales at the periphery of the abdomen ; abdominal 

 scales carinated, occasionally smooth or nearly so ; back with 

 several rows of spiny scales ; tail of ordinary length, similar to 

 the body, and fringed with conical scales. 



Habitat. — Kansas, Indian Territory, Texas, and Js'ew Mexico. 

 Possibly from Arkansas and Louisiana. 



The only dilference between cornutum and the supposed species 

 planiceps, was in the character of the abdominal scales, the former 

 being carinated, and the latter smooth. Prof. Cope, however, 

 after examining numbers of specimens, finds that the above forms 

 grade into each other, and, consequently, considers them but one 

 species. 



7. Phrynosoma regale. 



Phrynosoma regale G-irard, Herp. U. S. Expl. Exped., 1858, p. 406 ; 

 Baird, U. S. and Mex. Bound. Surv., 1859, pt. ii, p. 9, pi. xxviii, fig. 

 1-3 ; Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 310 ; Dumeril & Bo- 

 court, Miss. Sci. au Mex. et Am. Cent. Rept., 1870, p. 235, pi. xii, 

 fig. 12 ; Cope, Check List N. A. Batrach. and Rept., 1875, p. 49 ; Yar- 

 row, U. S. Geol. Surv. west of the 100th Meridian, v, 1875, p. 578 ; 

 Coues, in the above work, p. 593 ; Midler, Verh. Nat. Gesell., Basel, 

 1878, p. 634 ; Lockington, Am. Nat., 1880, p. 295. 



" Phrynosoma Solaris Gray, Cat. Liz. Brit. Mus., 1845, p. 229?" 



Head large ; nostrils anterior ; cephalic spines strongly devel- 

 oped, directed backwards ; the longest two of the temporals being 

 in the same plane as, and touching, the occipitals, all four being 

 subequal ; no plate or scale separating the occipital spines ; two 

 rows of enlarged pointed gular scales, one on each side of, and 

 distant from, the median line ; last inframaxillary plate smaller 

 than the preceding ; two rows of pyramidal scales at the periphery 

 of the abdomen, lower one very small ; abdominal scales carinated ; 

 back spinous ; tail of medium length, similar to the body, and 

 fringed with conical scales. 



Habitat. — Valle}^ of the Gila and Colorado Rivers. 



8. Phrynosoma taurus. 



Phrynosoma taurus Duges MSS., 1868 ; Duges, Cat. Vert. Mex., 1869 ; 

 Dumeril & Bocourt, Miss. Sci. an Mex. ft Am. Cent. Rept., 1870, p. 

 2!34, pi. xii, fig. 8 ; Duges, La Naturaleza, ii, 1S71-73, p. 302, fig. 



Head broad; nostrils anterior; occipital spines small and coni- 

 cal ; temporals strongly developed, conical, projecting very much 



