28 



FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 



Head 3$ ; depth 2^ to 3; D. 24 to 26; A. 8; scales 7-38 to 41-6. 

 Body robust, compressed, back arched; head moderately large; lips 

 very thin papillose, the long diameter of papillae at right angles to 

 mouth, giving the lips a plicate appearance; opercle strongly striate; 

 lower lip slightly broader than upper, lobes somewhat u -shaped; 

 interorbital convex, 2^ in head; snout 3^3 in head; dorsal fin falcate, 

 tips of longest rays when deflexed reaching past middle of its base; 

 longest rays i % in its base ; origin of dorsal slightly nearer tip of snout 

 than base of caudal ; distance between tip of pectoral and base of ven- 

 tral 2 in length of pectoral; pectoral if in head; ventral i>; caudal 

 peduncle deep, its least depth i% in its length; caudal fin forked, its 

 lobes about equal. 



Color light brownish, silvery below; middle of each scale silvery, 

 forming indistinct silvery lines along rows of scales; these more con- 

 spicuous on lower half of body. Length about 10 inches. 



A small species inhabiting the tributaries of the Rio Grande, on the 

 Mexican Plateau. 



23. Carpiodes elongatus sp. nov. METALOTE. 



Type, No. 4425, F. C. M., 9 inches in length; Linares, Nuevo 

 Leon. 



Rivers of northeastern Mexico between the Rio Panuco and the 

 Rio Grande. (San Juan; Montemorelos ; Linares; La Cruz.) 



FIG. 5. CARPIODES ELONGATUS Meek. 



Head 4 to 4^3 ; depth 3^ to 3^3 ; D. 23 to 26; A. 7; scales 8-38-5. 

 Body elongate, not much compressed, back little elevated; head 

 small; interorbital convex, its width 2f in head; diameter of eye 3^ 

 to 4 ; snout 3 % ; mouth small ; lips thin , the lower about twice as thick 

 as the upper; lips papillose, the papillae with long diameter at right 

 angles to the mouth, giving the lips a plicate appearance; opercles 



