400 S A U R I A. 



Subgenus BATRACHOSOMA, Fitz. 



Gen. Char.— Head rather large; vertex very much inclined forwards ; 

 snout protruding. Nostrils lateral, situated at the extremity of the 

 supraciliary ridge. Cephalic plates moderate and rugose. Spines 

 large. Submaxillar shields large, flattened, and acuminated. Auri- 

 cular apertures extant. Six approximated series of large, mental 

 scales. Sides of the neck rumpled ; throat transversely wrinkled. 

 A prescapular fold. Two horizontal series of pyramidal scales at 

 the periphery of the abdomen. Abdominal scales smooth. 



SY!<!.—Batrachosoma, FiTZ. Syst. Kept, i, 1843, 79. 



Observ. — Position of nostrils and abdominal scales smooth, as in 

 Tapaya; cephalic spines and physiognomy, as in PJirynosoma. Series 

 of large mental scales peculiar. The pyramidal scales at the periphery 

 of the abdomen, being disposed upon two series, constitute a feature 

 foreign to Tajpaya, and somewhat akin to Phrynosotna. 



Batrachosoma coronatum, Fitz. 

 (Plate XX, figs. 10-13.) 



Spec. Char. — Two occipital and five temporal spines. Labial plates 

 small, subequal. Submaxillar shields large, flattened, exteriorly 

 sharp-edged: the middle ones largest. Lower series of subpyra- 

 midal scales at the periphery of the abdomen, much smaller than 

 the upper. Scales under the head keelless, unequal : three or four 

 double longitudinal rows, upon the middle region, larger than the 

 rest, and acuminated. Abdominal scales subrhomboid, subacute. 

 Thirteen or fourteen pores under each thigh. Ground color greyish 

 or yellowish-brown above, maculated with black; beneath yellowish, 

 with scattered blackish spots. 



Syn. — Phrynosoma coronatum, Blatnv. in Nouv. Ann. Mus. d'hist. nat. IV, 1835. 

 284. PI. XXV, fig. 1, a ft c— Bum. & Bibr. Erp^t. g^n. IV, 1837, 318.— Holbr. N. 

 Araer. Herp. II, 1842, 97. PI. xiir.— Grd. in Stansh. Expl. Vail. Gr. Salt Lake, 

 Utah, 1852, 360. PI. viii, figs. 7-12.— Hallow, in Sityr. Rep. Exped. Zuni and 

 Color. Rivers, 1853, 122. 



