62 



UNITED STATES AND MEXICAN BOUNDARY. 



List of specimens. 



Ca.al. 

 No. 



Cor. No. 

 of teeth. 



No. of 

 spec. 



Age. 



Locality. 



When col- 

 lected. 



Whence obtained. 



Nature of 

 specimen. 



Collected by — 



252 

 253 



2801 

 2802 



6 

 1 



* 



Adult. 



Rio San Pedro, trib. of 

 Rio Gila 



do... .. .... 



■ 



1851 



• 

 1851 



Col. J. D. Graham. . . . 



Alcoholic. 

 do 



Jno. H. Clark. . ♦ • 

 do 









3. GILA EMORII, B. & G. 

 Plate XXXIII, Figs. 5—10. 



Spec Char. — Body elongated, compressed. Profile of head continuous with that of the body, and gradually tapering from 

 the nape to the snout. Head forming the fifth of the entire length. Mouth nearly terminal, though inferior still : the upper 

 jaw overlapping the lower one of the thickness of the lip ; the posterior extremity of the maxillar bone not extending as far as 

 the anterior rim of the orbit. Eyes circular, of medium size. Anterior margin of dorsal fin nearer the extremity of the snout 

 than the insertion of the caudal ; anterior margin of anal fin nearly opposite the posterior margin of the dorsal. Caudal fin 

 deeply furcated and slender. The extremity of the ventrals not extending to the anterior edge of the anal. The pectorals are 

 lanceolated, their extremity not reaching the insertion of the ventrals. 



* Syn.— Gila emorii, B. & G. in Proc. Acad. Nat. Sc. Philad. VI, 1853, 388.— Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 



1856, 205. 



The scales are small, elongated, sub-elliptical or sub-quadrangular, longer than deep, affecting 

 a curious arrangement (see fig. 5). The lateral line undergoes a slight deflection along the middle 

 of the flanks. 



Color uniform silvery, with a rather greyish tint along the upper regions. 



Plate XXXIII, fig. 5, represents Gila emorii, size of life ; fig. 6 is the head from beneath, 

 showing the outline of the mouth ; fig. 7, the head seen from above ; fig. 8, a dorsal scale; fig. 

 9, a scale from the lateral line ; and, fig. 10, a scale from the abdominal region. 



List of specimens. 





Catal. No. of 



No. 



spec 



Locality. 



When 

 collected. 



Whence obtained. 



247 



1 



Near the mouth of Gila river 



Nature of 

 specimen. 



Collected by 



1849 



Major Emory 



Alcobolic. 



Dr. Jno. L. Leconte 



1. TIGOMA PULCHELLA, Grd. 

 Plate XXXI V, Figs. 5—8. 



Spec Char.— The head is contained four times and a half in the total length. The mouth is small ; the posterior extremity 

 of the maxillar bone not extending as far as the anterior rim of the orbit. Diameter of the eye entering five times and a half in 

 the length of the side of the head. The greatest depth of the body is contained about five times in the total length, of which 

 the caudal tin forms the sixth part. Two rudimentary rays at the anterior margin of the dorsal fin instead of one. 



Stn.— Gilapulchella, B. & G. in Proc. Acad. Nat. Sc. Philad. VII, 1854, 29 



Tigoma pulchella, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 206. 



The scales are sub-elliptical, sometimes irregularly so, with radiating furrows upon their 

 posterior section alone; the lateral line being very much deflexed upon the middle of the flanks. 



D 2, 9; A 1,9; 4,1,9,8,1,3; V 9; PIT. 



