( 105 ) 



VII. Description of a new Species of Agama, brought from the 



Columbia River by Mr. Douglass. By Thomas Bell, Esq., 



F.R.S. 4- L.S. 



ReadJune 17, 1828. ; 'r-l 



Genus. AGAMA. Daudin. 



Agama Douglassii. 



Tab. X. 

 A. Poris femoralibus utrinque xx. 



Habitat in or4 occidentali Americae Borealis ad ripas fluminis 

 Columbiae. 



In its general form, colours, and marking, this species very 

 much resembles A. superciliosa, A. orbicularis, and others of the 

 same section of the genus. The head is obtusely triangular, 

 with a distinct ridge overhanging the orbits: the body sub- 

 orbicular and depressed ; the tail tumid at its origin, from 

 whence it becomes rather suddenly contracted, and tapers to 

 its extremity. The head, body, limbs and tail, are covered 

 on the upper side with small raised scales, interspersed with 

 larger ones which are aculeated, and most of them quadran- 

 gular. These form distinct ridges over the eyes, above the 

 ears, across the occiput, and along the sides of the body and 

 tail. The under side is wholly covered with small uniform 

 smooth scales. The gular fold is of considerable size. The 

 colour of the upper part is a mixture of yellowish-white and 

 VOL. XVI. p piceous 



