PHRYNOSOMA CORNUTUM. 403 



Iguanas, since 1837,* Fitzinger's appellation could not have been re- 

 tained for the present subdivision, even if that of Phrynosoma, in its 

 restricted sense, could not have been applied. As matters stand, how- 

 ever, this is the only subgenus to which the latter name rightfully 

 belonsjs. 



*o" 



1. Phetnosoma cornutujt, Gray. 



(Plate XXI, figs. 6-9.) 



Spec. Char. — Vertex very much inclined forwards ; occipital region 

 elevated. Temporal and occipital spines, subconical, long and 

 acute ; occipital ones much the largest and raised above the others. 

 Labial plates small, unequal. Scales under the chin very small, 

 with two distant series of more developed ones, and acute. Lower 

 series of subpyramidal scales at the periphery of the abdomen con- 

 spicuously developed, though somewhat smaller than the upper 

 series. Abdominal scales small, subrhombic, acute, and conspicu- 

 ously keeled. Femoral series of pores not extending over the inter- 

 femoral region, hence widely apart. Postanal scales small. Ground 

 color yellowish, spotted, and clouded with blackish ; beneath lighter, 

 either unicolor or spotted with black. 



^Y^.—Agavia cornuta, Harl. Journ. Acad. Nat Scl. Philad, IV, ii, 1825, 299. PI. 

 XX ; VI, I, 1829, 14; &, Med. and Phys. Research. 1835, 141, figs. 1 & 2.— Grlff. in 

 Guv. Anim. Kingd. IX, 1831, 216 (fig.). 



Tapaya cornuta, Cuv- Regn. Anim. 2d ed. II, 1829, 37. 



Lacerta tapayaxin, Bart. Med. & Phys. Journ. Ill, it, 18 . , 68. 



Phrynosoma Jiarlani, WiEGM. Hcrp. Mex. I, 1834, 54.— DuM. & Bibr. Erpet. gen. 

 IV, 1837, 314. 



Phrynosoma cornutum, Gray, Synops. Rept. in Griff. Anim. King. IX, 1831, 45; &, 

 Catal. Liz. Brit. Mus. 1845, 229.— Holer. N. Amer. Herp. IT, 1842, 87. PI. xi.— 

 Grd. in Stansb. Expl. Vail, of Gr. Salt Lake, 1852, 3G0. PI. viii, figs. 1-6.— Hallow. 

 in Sitgr. Rep. Exped. Zuni and Color. Rivers, 1853, 119. 



Phrynosoma hufonium, Wiegm. in Oken, Isis, XXI, 1828, 367.— Gray, Synops. 

 Rept. in Griff. Anim. Kingd. IX, 1831, 45. 



Phrynosoma orbiculare, HoLBR. N. Araer. Herp. II, 1842, 93. Plate Xii. 



Phrynosoma planiceps, Hallow, in Proc. Acad. Nat. Sci. Philad. VI, 1852, 178; &, 

 in Sitgr. Rep. Exped. Zuni and Color. Rivers, 1853, 124. Plate vii. 

 Tropidogaster cornutus, FiTZ. Synops. Rept. I, 1843, 79. 

 Tapayaxin, Bart. Med. & Phys. Journ. III. 



* Erpet. gen. IV, 1837, 329. 



