148 PROCEEDINGS OF THE ACADEMY OF [1885. 



II. Phrynosoma modestum. 

 Phrynosoma modest 'mi Girard, Stans. Expl. Vail. Gt. Salt Lake, 1852, p. 



361, ]>1. vi, fig. 4-8; Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 302; 



Dumeril & Bocourt, Miss. Sci. an Mex. ct Am. Cent., Kept., INTO, p. 



232; C<>\«: Check List N. A. Batrach. and Rept., 1875, p. 49; 



Yarrow, U. S. Geol. Surv. west of 100th Meridian, v, 1875, p. 577 ; 



Coues, in the above work, p. 594. 

 Doliosaurus modestus Girard, Ilerp. U. S. Expl. Expcd., 1858, p. 409 ; 



Baird, U. S. and Mex. Bound. Surv., ii, pt. ii, 1859, p. 10 ; Baird, 



P. R. R. Rept., x, 1859, Whipple's Route, Rept., p. 38. 



Head broader than long ; nostrils anterior ; cephalic spines 

 small; occipital spines extending as far as the longest of the 

 temporals, posteriorly ; auricular aperture sometimes wanting on 

 one or both sides, but when present, small and granular ; sub- 

 labial plates small and nearly equal ; inframaxillary plates broad 

 and pointed ; gular scales next to the inframaxillary plates 

 slightly larger than the others ; no pyramidal scales at the periph- 

 ery of the abdomen ; abdominal scales smooth ; back nearly 

 smooth, devoid of conical scales; tail nearly equal in length to 

 the body, a few conical scales along the basal margin. 



Habitat. — Western Texas, Utah, New Mexico and Arizona. 



12. Phrynosoma Maccalli. 



Anota Maccalli Ilallowell, Proc. Acad. Nat. Sci. Phila., 1852. p. 122 ; 



Hallowell, Sitgreaves' Exped. Zuni and Col. Rivers, 1853, p. 127, pL 



x, figs. 1, 2 ; Dumeril & Bocourt, Miss. Sci. au Mex. et Am. Cent. 



Rept., 1870, p. 230. 

 Doliosavrus Maccalli Girard, Ilerp. U. S. Expl. Exped., 1858, p. 408 ; 



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



figs. 4-6. 

 Phrynosoma Maccalli Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 310; 



Cope, Check List N. A. Batrach. & Rept., 1875, p. 49 ; Coucs, U. S. 



Geol. Surv. west of 100th Meridian, v, 1875, p. 593. 



Head small; snout truncated ; nostrils anterior; cephalic spines 

 long, strongly developed ; occipital spines slightly recurved ; 

 middle inframaxillary spines broadest and longest; one row of 

 enlarged gular scales upon each side of, and distant from, the 

 median line ; auricular apertures always wanting ; no pyramidal 

 scales at the periphery of the abdomen; abdominal scales smooth ; 

 back smooth as in modestum; tail as long as the body, margined 

 with conical scales. 



Habitat. — Deserts of the Gila and Colorada Rivers. 



