MOXOSTOMA — RED-HORSE 89 



distillery slops entering the streams from the adjacent distilleries. 

 The latter element was insignificant, however, in total amount, in- 

 sects and mollusks making fully 95 per cent, of the stomach contents 

 studied, mollusks being nearly twice as abundant as insects. In con- 

 sequence of the manner in which the food is collected from the bot- 

 tom, considerable quantities of mud are, of course, swallowed with it. 

 These fishes are caught mainly with seines and pound-nets, but 

 they also bite readily at the hook. 



Key to Species of MOXOSTOMA found in Illinois 



a. Folds of lower lip more or less broken up into papillae. 



b. Head short. 4+ to 5i in body; lower lip truncate behind, mouth small; 



developed dorsal rays 12 or 13 breviceps. 



bb. Head longer. 3J to 4J in body; halves of lower lip meeting in a sharp angle, 

 mouth large; developed dorsal rays 14 to 16 anisurum. 



aa. Lips strongly plicate. 



c. Head 4 to 4 ! in body; halves of lower lip meeting in a rather wide angle, 



mouth large; developed dorsal rays 12 to 14 aureolum. 



MOXOSTOMA ANISURUM (Rafinesque) 



(WHITE-NOSED SUCKER) 



Rafinesque, 1820. Ichth. Oh., 54 (Catostomus). 



G , VII, 2n (Catostomus carpio); J. & G . 139 (carpiol; M. V., 47; J & E., I, 190; 

 X.. 49 (Teretulus carpio i; J., 63 (Myxostoma carpio); F., 80 (carpio). 



Bodv stout, heavy forward, deep and compressed, the back elevated, 

 rather humped in front of dorsal in old specimens; depth 3.3 to 4.1 in 

 length. Size large, reaching a weight of 5 to 10 lb. Color pale, silvery, 

 darker above, nose and chin whitish; dorsal and caudal with some dusky, 

 lower fins white or light reddish. Head broad 

 and short, squarish in cross-section in region of 

 orbit, its length 3.5 to 4.3, width 5.2 to 6.5, depth 

 4.6 to 5.5 in head; interorbital space flat, 2.2 to 

 2.6 in head; snout rather long, 2.1 to 2.6 in head; 

 its tip squarish, little decurved, the profile nearly 

 straight to its tip when the mouth, is closed; 

 mouth rather large, the upper lip thin, plicate 

 papillose, the lower thicker, its folds broken into Fir,. 21 



evident papillae, the halves meeting at a sharp Lips of Moxostoma 



angle; eve rather large, slightly back of middle of anisurum 



4 to 6.4 in its length. Dorsal fin long, its 

 rays about IS (14 to 17), the longest about jj length of base of fin, the 

 free margin straight ; lower fins long, pecti irals reaching \ of distance from 

 pei toral to ventral basis; upper lobe of caudal a little longer than lower. 

 Scales 6, 42 45. 6; lateral line complete, somewhat flexuose, bul nearly 

 straight. 



