April, 1910. Fishes of Chicago — Meek and Hildebrand. 255 



plicate, the lower breaking into papillae on distal margin; lower lip 

 truncate behind; free margin of dorsal fin concave; upper lobe of 

 caudal falcate, usually longer than the lower; lateral line complete. 

 Color pale yellowish olive above, paler below; dorsal scarcely 

 dusky ; caudal light with reddish tinge ; lower fins salmon colored with 

 greenish margins. 



Fig. 26. Lips of the Short-headed Redhorse. 



Moxostoma breviceps (Cope). (From Forbes and Richardson.) 



Length about 15 inches. 



It inhabits streams and lakes of the Great Lake Region and the 

 Upper Mississippi Valley. A food fish of not much importance. 

 Fox River, McHenry, Illinois. 



Genus Catostoimis Le Sueur. 



Fine-scaled Suckers. 



Body elongate, subfusiform; head elongate, rather broad; mouth 

 inferior; lips thick, papillose; upper lip protractile; posterior fontanelle 

 large; pharyngeal teeth shortish; air bladder in two parts; lateral 

 line developed. 



a. Head transversely convex above; scales in lateral series more 

 than 60 ; scales on anterior portion of the body reduced in size. 



b. Scales in lateral series 95 to 115. catostomus, 255 

 bb. Scales in lateral series 68 to 80. commersonii, 256 

 aa. Head broad, transversely concave; scales large, 48 to 55 in the 



lateral series. nigricans, 257 



Catostomus catostomus (Forster). Long-nosed Sucker; Red 



Sucker; Northern Sucker. 



Head 4X to 4.6; depth 4.3 to 4.6; D. 10 or 11; A. 7; scales 95 to 

 114. 



Body elongate, subterete; head long and slender; interorbital 

 space convex; mouth small, lips coarsely tuberculate; snout long, 

 rather pointed, overhanging the large mouth; eye small 8.2 in head; 



