186. 3. IGUANID^ 



31. Uta thalassina Cope 

 San Lucan Giant Uta 



Uta Ihalassina Cope, Proc. Acad. Nat. Sci. Phila., 1863, p. 10+ (type 

 locality, Cape St. Lucas) ; Cope, Proc. Acad. Nat. Sci. Phila., 

 1864, p. 177; Cope, Proc. Acad. Nat. Sci. Phila., 1866, p. 

 312; Cope, Bull. U. S. Nat. Mus., No. 1, 1875, pp. 48, 

 93; Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, p. 54; Gar- 

 man, Bull. Essex Inst., Vol. XVI, No. 1, 1884, p. 16; Cope, Bull. 

 U. S. Nat. Mus., No. 32, 1887, p. 35; Belding, West Amer. 

 Scientist, Vol. Ill, No. 24, 1887, pp. 96, 98; Stejneger, Proc. 

 U. S. Nat. Mus., 1894, pp. 589, 591; Van Denburgh, Proc. Cal. 

 Acad. Sci., Ser. 2, Vol. 5, 1895, p. 99; Cope, Report U. S. Nat. 

 Mus. for 1898, 1900, p. 301, fig. 35; Mocquard, Nouv. Arch. 

 Mus. Hist. Nat. Paris, Ser. 4, Vol. 1, 1899, p. 301, pi. XI, figs. 2, 

 3 (part) ; Ditmars, Reptile Book, 1907, p. 123; Dickerson, Copcia, 

 No. 50, 1917, p. 98; Stejneger & Barbour, Check List N. Amer. 

 Amph. Rept., 1917, p. 52; Van Denburgh & Slevin, Proc. Cal. 

 Acad. Sci., Ser. 4, Vol. XI, 1921, pp. 51, 57; Nelson, Mem. Nat. 

 Acad. Sci., Vol. XVI, 1921, pp. 114, 115; Terron, Mem. y Rev. 

 Soc. Cient. Antonio Alzate, Vol. 39, 1921, p. 164; Schmidt, Amer. 

 Mus. Novitates, No. 22, 1921, p. 4. 

 Petrosaurus tkalassinus, Bouienger, Cat. Lizards Brit. Mus., Vol. II, 1885, 

 p. 205. 



Description. — Head flattened, swollen at temples. Snout 

 rounded. Nostrils large, superior, and a little nearer to 

 end of snout than to orbit. Ear-opening large, with a very 

 weak anterior denticulation. Head scales smooth, slightly 

 convex anteriorly; frontal transversely divided j largest 

 supraoculars separated from frontals, frontoparietals, and 

 parietals, by two series of small plates; interparietal very 

 large. Six superior and seven inferior labials to below 

 middle of orbit. Several series of enlarged sublabials pass- 

 ing gradually into the granular gulars which are slightly 

 largest centrally. First of two strong gular folds ends in a 

 large pouch at each side; second fold continued as a flap ia 

 front of each arm, and covered with smooth flat plates, the 



