FAMILY IV. CATOSTOMID^;. 29 



strongly striate; dorsal fin falcate, the tip of first rays when deflexed 

 reaching past middle of the base of fin ; base of dorsal 2 in body ; 

 origin of dorsal fin nearer tip of snout than base of caudal by a distance 

 equal to the length of the snout; length of pectoral i^ in head; dis- 

 tance from tip of pectoral to base of ventral 2 in length of pectoral; 

 ventrals 1^3 in head; caudal peduncle long and slender, its least 

 depth 1^2 in its length (measured from last dorsal ray) ; caudal forked, 

 the lobes about equal; lateral line decurved anteriorly. 



Color light brownish above, lighter below, silvery; fins all plain. 

 Length about 12 inches. 



This species is more slender and has thicker lips than the preced- 

 ing, which it most resembles. 



24. Carpiodes labiosus sp. nov. 



Type, No. 4492, F. C. M., T.O I /^ inches in length; Valles, San 

 Luis Potosi. 



Basin of the Rio Panuco. (Valles.) 



FIG. 6. CARPIODES LABIOSUS Meek. 



Head $%; depth 3! ; D. 23; A. 9; scales 10-43-6. Body rather 

 elongate, moderately compressed; back not much arched; head 

 rather small; mouth large, overhung by the rather blunt snout; lips 

 very thick, papillose, resembling those of Catostomus; eye 4 in head; 

 snout 2; opercles not striate; dorsal fin falcate, when deflexed the 

 tips of longest rays reaching ^ distance to base of last ray ; origin of 

 dorsal fin midway between base of caudal and tip of snout, slightly 

 in advance of ventrals ; base of dorsal fin 3^ in length of body ; dis- 

 tance from last dorsal ray to base of caudal i/^ in the base of the 

 dorsal fin; caudal peduncle slender, its least depth i in distance 

 from last dorsal ray to base of caudal; pectoral fin i ^ in head, its tips 

 not reaching base of ventrals by a distance equal to ^3 of their length ; 

 ventrals i in head, their tips not reaching origin of anal fin. 



