CATOSTOMID^. CIX. 297 



6. CARP/ODES, Rafinesque. CAEP SUCKERS. 



* First rays of dorsal very much elevated and attenuated, about as 

 long as the base of the fin. 



1. C. velifer, (Raf.) Ag. SPEAR FISH. SAIL FISH. 

 QUILLBACK. SKIMBACK. Muzzle conic, much less obtuse 

 than in the next; depth 2-J in length; head 3f ; eye 4 

 in head; color pale, scarcely silvery, as in all species; 

 D. 22; lat. 1. 37. Ohio R. 



2. C. difformis, Cope. HIGH - BACKED CARP SUCKER. 

 Snout very blunt; eye 4 in head; head 3f in length; 

 depth 2^; body short and high; dorsal fin strongly fal 

 cate; snout minutely tuberculate in spring as in some 

 other species; D. 26; A. 8; V. 9; lat. 1. 37. Western 

 streams (described from L. Erie specimens of &quot;6 y . 

 cutisanserinus&quot; Cope = C. selene. Cope.) 



** Anterior dorsal rays scarcely filamentous, little more than half 

 the length of the base of the fin. 



3. C. bison, Ag. BUFFALO CARP. Muzzle very long, 

 conic; eye large, 4^ in head; longest dorsal rays reach 

 ing nearly to end of fin; D. 28; lat. 1. 40. Mississippi 

 Valley and W. 



4. C. thompsoni, Ag. LAKE CARP. Short and stout; 

 scales narrowly exposed; eye small, 5J in head; depth 

 2^ in length; long rays of dorsal reaching 22d ray; 

 D. 28; lat. 1. 41. Great Lakes. 



5. C. cyprinus, (LeS.) Ag. SILVERY CARP SUCKER. 

 Body oblong; dorsal as above; eye 5 in head; depth 3f 

 in length; head 3; D. 30; lat. 1. 40. Rivers, chiefly 

 eastward. 



6. C. carpio f (Raf.) Jordan. OLIVE CARP SUCKER. 

 Elongated; head small; dorsal rays short; depth 3 in 

 length; eye 4| in head; D. 30 or more; lat. 1. 36; the 

 largest species. Ohio Valley. (C. nummifer, Cope.) 



