' 





ICHTHYOLOGY, 



61 



XXVIII 



fig. 11, represents Tiaroga colitis, size of life; fig. 12 is a scale from the 

 dorsal region ; fig. 13, a scale from the lateral line ; fig. 14, a scale from the abdominal region. 



List of specimens. 



Catal. 

 No. 



Cor. No. 

 of teeth. 





155 



2731 



No. of 

 spec. 



Locality. 



. 



When 



collected 



10 



Rio San Pedro, trib. of Gila 



1851 



Whence obtained. 



Nature 

 of spec. 



Col. J. D. Graham 



Alcoholic. 



Collected by 



Jno. H. Clark 









1. GILA ELEGANS, B. & G. 



Spec. Char. — Body very slender and caudal region very much attenuated. Head very much depressed, constituting about 

 the fifth of the total length ; eyes elliptical, their diameter entering seven times in the length of the side of the head. Posterior 

 extremity of maxillar bone extending to a vertical line drawn in advance of the orbit. Isthmus very small. Fins very much 

 developed. Scales sub-elliptical, narrower posteriorly than anteriorly ; radiating furrows few and obsoletely developed. Color 

 uniform reddish brown above, yellowish silver beneath ; fins dull yellow. 



Syn. — Gila elegans, B. & G. in Proc Acad. Nat. Sc. Philad. VI, 1853, 369 ; and, in Sitgr. Ilep. Exped. Zuiii and Color. 



Riv. 1853, 149 ; Fishes, pi. ii.— Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 205. 



List of specimens. 



Catal . 

 No. 



No. of 

 spec. 



Locality, 



When 

 collected. 



250 



1 



Colorado river, Cal 



1854 



Whence obtained 



Nature of 

 specimen. 



Collected by 



Major Emory 





Alcoholic- Arthur Schott 



2. QILA GRAHAMI, B. & G. 

 Plate XXIV, Figs. 7—12. 



Spec. Char— Body sub-fusiform, compressed; head entering about four times and a half in the total length. Posterior 

 extremity of maxillar bone extending to a vertical line drawn across the anterior rim of the orbit. Anterior margin of dorsal fin 

 somewhat nearer the insertion of the caudal than the extremity of the snout ; anterior margin of anal situated posteriorly to the 

 dorsal. Caudal strong and deeply furcated. 



Syn.— Gila grahamii, B. &. G- in Proc. Acad. Nat. Sc. Philad. VI, 1853, 389.— Grd. in Proc. Acad. Nat. Sc. Philad. 



VIII, 1856, 205. 



The disposition and structure of the scales will be better understood by comparing the figure 

 of this species with those of the following one. The rays of the fins are : 



D 2, 10 ; A 2, 10 ; C 10, 1, 9, 8, 1, 10 ; V 1, 10 ; P 17. 



The upper surface of the head and the dorsal region are reddish brown ; the upper half of the 

 flanks greyish brown, and the lower half greyish yellow. The abdomen is dull yellowish. A 

 metallic reflect prevailing all over the body. The fins being unicolor, of the tint of the region to 



which each of them belongs. 



Plate XXIV, fig. 7, represents Gila grahami, somewhat reduced in size ; fig. 8 is the head 

 seen from beneath, showing the outline of the mouth ; fig. 9, the head seen from above ; fig. 10, 

 a scale from the dorsal region ; fig. 11, a scale from the lateral line ; and, fig. 12, a scale from 

 the abdominal region. 



