Family IV. Catostomid^;. 27 



Carpiodes velijer, in part, Jordan & Evermann, Bull. 47, U. S. Nat. 

 Mus., 1896, 167. 



Lowland streams from the Rio Panuco to the Rio Grande. (Garza 

 Valdez; Forlon.) 



Head 3%"; depth 2f; D. 24; A. 8; scales 9-36-5. Body deep, 

 compressed, back considerably arched ; head broad, convex ; interorbital 

 2^ in head; eye 5; snout 3;^; mouth moderately large, inferior; lips 

 rather thick, the lower plicate, each plication broken into two or 

 three parts; upper lip papillose, the greatest diameter of papillae at 

 right angles to mouth; opercles faintly striate; origin of dorsal slightly 

 nearer tip of snout than base of caudal; dorsal fin falcate, tips of its 

 longest rays reaching beyond middle of fin ; longest ray 1 }4 in base of 

 fin, which is 2% in body; tips of pectorals reaching base of ventrals; 

 length of pectoral 1^3 in head, and slightly longer than ventrals; tips 

 of ventrals reaching 2 /$ of distance between its base and origin of 

 anal; caudal peduncle deep, its least depth nearly equal to its length 

 and i3/£ in length of head; caudal fin forked, the two lobes about equal. 



Color light plumbeous above, lighter below; fins plain, rather 

 darker in the larger specimens. Length probably 18 inches to 2 feet. 



Longest specimen seen by me 12^ inches, taken at Forlon. A 

 large, rather dark colored buffalo fish inhabiting the larger rivers of 

 northeastern Mexico. 



22. Carpiodes microstomus sp. nov. 



Type, No. 3542, F. C. M., ^% inches in length; Santa Rosalia, Chi- 

 huahua. 



Carpiodes tumidus Meek, Field Col. Mus. Pub. 65, 1902, 74; Santa 

 Rosalia; Jimenez (not Carpiodes tumidus Girard). 



Basin of the Rio Conchos in Chihuahua. 



Fig. 4. Carpiodes microstomus Meek. 



