250 Field Museum of Natural History — Zoology, Vol. VII. 



Color dull brownish olive, never silvery. 



This species reaches a weight of 40 lbs., a little smaller than the 

 preceding. 



It is usually found with the preceding species, which it much 

 resembles in appearance and habits. Not known to occur in the 

 Great Lake Basin. 



Genus Carpiodes Rafinesque. 

 The Carp Suckers. 



Body thin, compressed; ventral Hne almost straight, the dorsal 

 much arched; head small, short; lips thin and slightly striate, the 

 upper protractile downwards; eye equidistant from lower posterior 

 angle of preopercle and upper corner of gill cleft; pharyngeal bones 

 broad but thin, the teeth weak and much compressed; dorsal fin 

 long, of 23 to 30 rays, the anterior ones produced to more than half 

 length of fin; lateral line complete; coloration silvery. All are used 

 for food, but of less value than species of Ictiobus. 



a. Snout short, 3.5 to 4.5 in head; nostrils well forward, the dis- 

 tance from anterior nostril to end of snout less than diameter 



of the eye. 



difformis, 



2.^0 



aa. 



Snout longer, 3.0 to 3.5 in head; nostrils situated well back, 

 the distance from the anterior nostril to end of snout usually 



greater than diameter of the eye ; tip of lower jaw far in advance 

 of the nostrils. velifer, 251 



Carpiodes difformis Cope. Blunt-nosed River Carp. 



Head 3.9 to 4.3 ; depth 2.4 to 2.7 ; D. 24 to 25 ; A. 8; scales 35 to 37. 



Fig. 23. Blunt-nosed River Carp 



Carpiodes difformis Cope. (From Forbes and Richardson.) 



