13. PHRYNOSOMA 4-11 



Phrynosoma harlanii VViecmann, Herpetologia Mex., 1834, p. 54; Dum- 

 ERiL & BiBRON, Erpetologie Generale, Vol. IV, 1837, p. 314; Spring 

 & Lacordaire, Bull. Acad. Roy. Brussels, 1842, Pt. II, p. 192, 

 fig. 2; DuMERiL, Cat. Meth. Coll. Rept. Mus. Hist. Nat. Paris, 

 1851, p. 28. 



Phrynosoma orbiculare Ho lb rook, N. Amer. Herpetology, Ed. I, Vol. 

 Ill, 1838, p. 61, pi. 10, & Ed. 2, Vol. II, 1842, p. 93, pi. XII. 



Phrynosoma {Tropidogaster) cornutus Fitzinger, Syst. Rept., I, 1843, 

 p. 79. 



Phrynosoma {Tropidogaster) bufonium Fitzinger, Syst. Rept., I, 1843, 



P- 79- 



Phrynosoma planiceps Hallowell, Proc. Acad. Nat. Sci. Phila., 1852, 

 p. 178 (type locality, Western Texas near the Rio Grande); 

 Hallowell, Sitgrcaves' Exped. Zufii and Colorado Rivers, 185 3, 

 p. 124, pi. VII; Dumeril, Arch. Mus. Hist. Nat. Paris, Vol. VIII, 

 185 5, p. 5 52, Dumeril & Bocourt, Miss. Sci. Mex. Rept., le livr., 

 1870, pi. XII, fig. II, & 46 livr., 1874, p. 238; Cope, Bull. U. S. 

 Nat. Mus., No. i, 1875, p. 49; Yarrow, Surv. W. looth Merid., 

 Vol. V, 1875, p. 579, pi. XXIV, fig. i-ib; Coues, Surv. VV. looth 

 Merid., Vol. V, 1875, p. 593, pi. XXIV, figs. i-ib. 



Phrynosoma cornutum planiceps Boulenger, Cat. Lizards Brit. Mus., 

 Vol. II, 1885, p. 246. 



Description. — Nostrils opening above lines joining sup- 

 erciliary ridges with end of snout. Head-spines large and 

 usually straight; three to six temporals, one occipital, and 

 one postorbital on each side, and one small interoccipital. 

 Sometimes with small spines above and between temporals 

 and eye, and usually several in front of occipitals. Tem- 

 poral scales with ridges running in general direction of tem- 

 poral spines. Other upper head scales flat or conical, often 

 with numerous ridges and granulations. One longitudinal 

 series of gular scales enlarged, becoming smaller anteriorly, 

 nearly continuous with lower group of spines on neck. 

 A continuous series of large spinose sublabials, larger pos- 

 teriorly. Two or three groups of spines on each side of 

 neck, lower usually largest. Back and tail bearing large, 

 scattered, elevated, keeled, tubercular scales, between which 



