1885.] NATURAL SCIENCES OF PHILADELPHIA. 143 



Agama orbicularis Daudin, Hist. Nat. Rept., iii. 1805, p. 406; Voigt, 



Ucbcrs. Thierr. Cuv., ii, 1831, p. 54. 

 Phrynosoma orbiculare Wiegmann, in Oken., Isis, xxi, 1828, p. 367; 



Wagler, Naturl. Syst. Amph., 1830, p. 14G; Gray, Grill'. Anim. 



King., ix, 1831, p. 45; Wagler, Descr. and Lou. Amph., 1*33, pi. 



xxiii, figs. 1 and 2 : Schinz, Naturg. und Abild. der Rept., 1833, p. 



88, pi. xxvii, fig. 2 : Gravenhorst, Act. Acad. Cses. Leop. Carol. Nat. 



Cur.. \\i. pt. ii, 1833, p, 912, pi. Ixiii ; Wiegmann, Herp. Mex., 1834, 



p. 53 : Dumeril & Bibron, Erpet. gener., iv, 1837, p. 321 ; Gray, Cat. 



Liz. Brit. Mus., 1845, p. 228; Aug. Dumeril, Cat. Meth. Coll. Rep. 



Mus. Paris, 1851, p. 78; Girard, Stans. Expl. Vail. Gt. Salt Lake, 



1852, p. 359 ; Sumiehrast, Ann. and Mag. Nat. Hist., xiii, 1864, p. 



507 ; Peters, Berlin Monatsb., 1869, p. 875 ; Midler, Verh. Natur. 



Gesell., Basel, 1878, p. 634 ; AVeidersheim, Zool. Anz., i, 1878, p. 105. 

 Phrynosoma Wiegmanni Gray, Beechey's Voy. Pacif. Zool., 1839, p. 96. 

 Tapaya orbicularis Girard, Herp. U. S. Expl. Exped., 1858, p. 394 : 



Dumeril & Bocourt, Miss. Bci. an Mex. et Am. Cent. Rept., 1870, p. 



221, pi. xi, fig. 1. 



Tapaya orbicularis, var. Cortczi Dumeril & Bocourt, Miss. Sci. au Mex. 



' et Amer. Cent. Kept., 1S70, p. 223, pi. xi, fig. 2. 

 Tapaya orbicularis, var. Dugesi Dumeril & Bocourt, Miss. Sci. au Mex. 

 et Am. Cent. Kept., 1870, p. 224, pi. xi, fig. 3. 



Head as broad as long ; cephalic spines moderately developed ; 

 occipital spines equal to, or a little more prolonged than, the 

 longest of the temporals, posteriorly ; sublabial plates very 

 small ; a large conical scale at the angle of the mouth ; infra- 

 maxillary plates small, equal in size to the posterior sublabials ; 

 one row of pj^ramidal scales at the periphery of the abdomen ; 

 abdominal scales smooth ; back spinous; tail of ordinary length, 

 similar to the bocl3', and sparsely fringed with conical scales. 



Habitat. — The plateaus of Mexico. 



4. Phrynosoma coronatum. 



Phrynosoma coronatum Blainville, Nouv. Ann. Hist. Nat., iv, 1835, p. 

 284, pi. xxv, fig. Irtand6c; Dumeril & Bibron, Erpet. gener., iv, 

 1837, p. 318 ; Holbrook, N. A. Herp., ii, 1842, p. 97, pi. xiii ; Dekay, 

 Zool. New York, iii, 1842, p. 31 ; Aug. Dumeril, Cat. Meth. Coll. 

 Rept. Mus. Paris, 1851, p. 7s ; Girard, Stans. Expl. Vail. Gt. Salt 

 Lake, 1852, p. 300, pi. viii, figs. 7 1 2 ; Hallowell, Sitgreaves' Exped. 

 Zuni and Colorado Riv., 1853, p. 122 ; Sanders, Proc. Zool. Soc. 

 Lond., 1874, p. 71-78 (Myology); Cope, Check List of N". A. Batrach. 

 and Rept., 1875, p. 50 ; Lockington, Am. Nat., xiv, 1880, p. 295. 



