228 REPTILES. 



Olive, whitish marbled, black spotted ; back irregularly gra- 

 nular, with scattered groups of elongated conical angular spines ; 

 head with short tubercles on the eyebrows and lower part of the oc- 

 ciput and temple ; head-shields keeled ; chin with uniform small 

 scales, and a short series of large keeled scales, separated from the 

 similar-shaped lower lip- shields by small scales, and not connect- 

 ed behind with the larger lip-shields; belly granular, not fringed 

 on the sides ; femoral pores in 2 nearly contiguous arched series ; 

 tail with a group of large scales near the hinder edge of the 

 cloaca. 



a. In spirits. California. Presented by Thomas Bell, Esq. 



** Head spinose. Belli/ without any lateral spines. Scales 



of the belly smooth. 



The Tapayaxin. Phrynosoma orbiculare, Weigm. Isis, 1828, 

 367. H. Mex. 53, t. 8,/. 1. Wagler, Icon. t. 23,/. 1, 2. Schinz, 

 Rept. 88, t. 27, /. 2. Gravenh. Act. Nat. Cur. xvi. 915, t. 63. 

 Dmn.etBih. E.G.iv. 321. Agama Tapaye orbicularis, Cuv. 

 R. A. ii. 37. Tapayaxin, Hern. Mex. iv. &7. P. Weigmanni, 

 Gray, Zool. Beecheyh Voy. 96. 



Lower jaw with a series of triangular keeled scales, separated 

 from the lower lip-shields by some small scales, and with a paral- 

 lel series of larger triangular scales from the angle of the mouth, 

 behind ; chin with small unifoim scales ; ventral scales smooth ; 

 belly not fringed on the sides ; back with scattered rather broad 

 angular keeled conical spines, with some large keeled scales at the 

 base ; lower edge of the temple with a series of large compressed 

 tubercles ; occiput with 2 elongated spines ; head-shields rugose, 

 uniform, flat, in front of the occiput convex. 



a. Stuffed. Mexico. Presented by William Ogilby, Esq. 



*** Head spinose. Back and belly ivith a series of lateral spines. 

 Scales of the belly smooth. Femoral pores continued, or only 

 separated by a narroiv preanal space. 



The Crow^]sed Tapayaxin. Phrynosoma Blainvillii, Gray, 

 Zool. Beecheifs Voy. 96, t. 29, f. 1, (young). P. coronatum, Blainw 

 N. Mem. Mus. iv. 28, t. 25, f. 1. Bum. et Bib. E. G. iv. 318. 



Lower jaw with a series of compressed triangular keeled shields, 

 parallel and close to the lower labial shields ; chin with 4 rows of 

 rather larger scales on each side, the outer on each side largest, 

 and forming a toothed crest ; ventral scales smooth ; back with 

 scattered short broad keeled scales, with small granules at their 

 base ; femoral pores continued or only separated by a narrow pre- 

 anal space; tail with some large plates beneath, just behind the 

 cloaca ; head-shields convex ; lower part of the temple and occi- 

 put with a series of compressed spines. 



