40 



UNITED STATES AND MEXICAN BOUNDARY. 



The anterior two rays, in both the dorsal and anal fins, are rudimentary ; so also the exterior 

 one in the ventrals. The upper regions are purplish black, with an orange lateral band from 

 head to tail, the inferior regions being yellowish white. 



D 2, 13 ; A 2, 1 ; 4,1,8,8,1,4,; V 1, 9 ; P 19. 



Plate XXIII, fig. 6 represents Acomus guzmaniensis, size of life ; fig. 7 exhibiting the mouth 

 and lips ; 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. 



No of 

 spec. 



Age. 



Locality. 



When col- 

 lected. 



| 



Whence obtained. 



Nature of 

 specimens. 



Collected by — 



260 



2 





Janos River, trib. of 

 Lake Guzman, Chih'a. 



1854 





Alcoholic 



Dr. C. B. Kennedy. . , 



*m \J w 





CATOSTOMUS BERNARDINt, Grd. 



Plate XXIII, Figs. 1 



5. 



Spec Char. — A specimen of seven inches and a-half, slender and graceful ; the head forming somewhat less than the fifth 

 of the total length. The eye is lar^e and sub-circular ; its horizontal diameter entering a little over four times in the length of 

 the side of the head. The upper margin of the dorsal is sub-convex, the tips of its posterior rays reaching a vertical line which 

 would intersect ihe anus. The caudal is sub-crescentic posteriorly. The ventrals and pectorals are well developed. 



Syn. — Catostomus bernardini, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 175. 



The scales are elongated, somewhat irregular upon their anterior and posterior edges, and 

 exhibit radiating furrows upon both the anterior and posterior sections, and apparently more 

 numerous upon the former section than upon the latter. 



D 15 ; A 10 ; 5,1,8,8,1,5; V 10 ; P 16. 



The color is uniform purplish black above, and yellowish white beneath. 



Plate XXIII, fig. 1 represents Catostomus bernardini, size of life ; fig. 



mouth and lips ; fig. 3, a dorsal scale ; fig. 4, a scale from the lateral line ; and, fig. 5, a scale 



from the abdominal region. 



List of specimens. 



2 exhibiting the 



Catal. 



No. 



174 



No. of 

 spec. 



Age. 



i 





Locality. 



San Bernandirio, in an 

 affluent of the Rio 

 Huagui, west of the 

 Sierra Madre, Mex, 



When col 

 lected. 



Ic54 



Whence obtained. 



Mtj. Emory- 



Nature of 

 specimen. 



Collected by 



Alcoholic. Dr. C. B. Kennerly 



• • • 



CAMPOSTOMA 



r 



Gev. Char. — Head sub-conical; bofy sub-fusiform: both compressed. Snout obtuse and protractile. Mouth inferior, 

 though its gape is horizontal. Lips very conspicuously developed ; no barbels or cirrhi. Eyes of moderate development ; isthmus 

 very wide. Origin « f ventrals situated in advance of the ante ior margin of the dorsal. Caudal furcated. Scales of dorsal 

 region deeper than long ; of the abdominal region longer than deep, with radiating furrows upon the posterior section or poste- 

 rior half. Pharyngeal bones strongly curved, with a small dilatation upon their convexity. Teeth of the cultriform kind, of 

 the grinding type, occasionally somewhat hooked. They are disposed upon a single row of four, or else upon a double row of 

 four and one, in the following manner : 4 — 4, or I j 4 — 4 | I. 



Syn.— Campostoma, Agass. in Amer. Journ. of Sc. and Arts, 2d ser. XIX, 1855, 219.— GRr. in Proc. Acad. Nat. Sc. 



Philad. VIII, 1856, 176. 



