54 



UNITED STATES AND MEXICAN BOUNDAEF. 



The upper regions are purplish brown ; a silvery band along the middle of the flank ; 

 inferiorly yellowish orange. Fins unicolor ; the superior ones greyish, the inferior yellowish. 



1,8; A 2, 1 ; 7, 1, 9, 8, ly 6 ; V 7 ; P 14. 



Plate XXIX, fig. 18, represents Codoma vittata, size of life ; fig. 19 is a dorsal scale ; fig* 

 20, a scale from the lateral line ; and, fig. 21, a scale from the abdominal region. 



List of specimens. 



Catal. Cor. No. 



i 

 No. of teeth. 



No. of 

 spec. 



A e. 



Adult. 



Locality. 



When collected. 



Whence obtained. 



Nature of 

 specimen. 



Collected by — 



92 2692 



10 



Valley of Mexico 



1855 



Jno. Potts, Esq .. 



Alcoholic - - - 



Jno. Potts, Esq .. 



1. CYPRINELLA MACROSTOMA, Grd. 



Plate XXXI, Figs. 5—8. 



This species is very characteristic. The body is deep upon its middle, tapering posteriorly. 

 The head is sub-conical, with a prominent snout and a very large mouth. The eye is well 

 developed. The ventrals are inserted somewhat in advance of the anterior margin of the 

 dorsal fin. The ground color is reddish, with a silvery streak along the middle of the flank, 

 extending likewise over the opercular apparatus. 



Syn. — Cyprinella macrostoma, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 198. 



Plate XXXI, fig. 5, represents Cyprinella macrostoma, size of life ; fig. 6 is a scale from the 

 dorsal region ; fig. 7, a scale from the lateral line ; and, fig. 8, a scale from the abdominal region. 



Catal. Cor. No. No. of Acre 

 No. of teeth spec. 



129 

 130 



3 Adult. 



List of specimens. 



Locality. 



When 

 collected. 



2711 



3 



Devil's river, Texas 

 China, New Leon . . 



1851 



1853 



Whence obtained. 



Nature of 

 specimens. 



Collected by 



Col. J. D. Graham. . . . 

 Lt. D. N. Couch 



Alcoholic. 



• • • •CIO • m • • 



John H. Clark 



Lt. D. N. Couch 



2. CYPRINELLA VENUSTA, Grd. 



Plate XXXI, Figs. 1—4. 



Gracefully compressed and fusiform in profile. The snout protruding and sub-conical. The 

 species is related to C. macrostoma, from which it chiefly differs by the relative size of its 

 mouth and shape of the body. The ventrals are likewise inserted somewhat in advance of the 

 anterior margin of the dorsal. Greyish red above, pale beneath ; sides silvery. A black 

 patch at the base of the caudal fin. 



Syn.-— Cyprinella vtnusta, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 198. 



Plate XXXI, fig. 1, represents Cyprinella venusta, size of life ; fig. 2 is a dorsal scale ; fig. 3, 

 a scale from the dorsal region ; and, fig. 4, a scale from the abdominal 



region. 



