254 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. VII. 



4.0 to 5.8 in head; free margin of dorsal straight, the fin a little higher 

 than long; upper lobe of caudal a little longer than the lower; lateral 

 line complete. 



Color uniformly olivaceous above and on sides, becoming pale 

 below ; dorsal dusky ; lower fins with some orange at base ; the outer 

 margins dusky. 



Length about 18 to 24 inches. 



This fish inhabits the clearer streams and lakes from the Assini- 

 boin through the Great Lake Region to Arkansas and Georgia. It 

 spawns in April and May, ascending streams for that purpose. Of 

 little value as a food fish. 



Fox Lake, Illinois; Fox River, McHenry, Illinois; Dead River. 

 Beach, Illinois; Hickory Creek, New Lenox, Illinois. 



Moxostoma anisurum (Rafinesque). WHITE-NOSED SUCKER. 



Head 3.5 to 4.3 ; depth 3.3 to 4.1 ; D. 14 to 17 ; A. 7 ; scales 42 to 45. 



Body elongate, compressed, robust anteriorly, the dorsal region 

 elevated; head broad and short; interorbital space flat, 2.2 to 2.6 

 in head; snout long, 2.1 to 2.6 in head; mouth rather large, the lips 

 thick, the folds broken into papillae; eye large, 4.0 to 6.4 in head; 



FIG. 26. LIPS OF THE WHITE-NOSED SUCKER. 



Moxostoma anisurum (Raf.)- (From Forbes and Richardson.) 



dorsal fin long, its free margin straight, upper lobe of caudal a little 

 longer than the lower; lateral line complete. 



Color pale, silvery, darker above, the nose and chin whitish; 

 dorsal and caudal with some dusky; lower fins white to light reddish. 



Length about 18 inches. 



It inhabits the clearer streams of the Great Lake Region to 

 North Carolina. Smaller and less common than the preceding. 



Moxostoma breviceps (Cope). SHORT-HEADED REDHORSE. 



Head 4.6 to 5.4; depth 3.8 to 4.6; D. 12 or 13 ; A. 7; scales 43 to 45. 



Body subfusiform, moderately compressed; head short, sub- 

 conical, interorbital space 1.9 to 2.4 in head; snout 2.3 to 2.9 in head; 

 diameter of eye 4 to 5 in head; mouth small, upper lip coarsely 



