188 REPORT OF STATE GEOLOGIST. 



AA. Scales along the lateral Hue fewer than sixty; not closely crowded 

 in front, 

 b. Lateral line absent or deficient. Head convex between eyes. 

 c. Lateral line absent at all times of life (Erimyzon). 



sucetta, p. 189. 



cc. Lateral line deficient in young ; almost complete in the 



adult {Minytrema). melanops, p. 190. 



bb. Lateral line present and complete. Head concave between 



the eyes. nigricans, p. 191. 



Catostomus catostomus (Forster). 



Northern Sucker ; Long-nosed Sucker. 



Catostomus longirostris, Jordan and Gilbert, 1882, S, 126. ' 



Body elongated and rather slender ; little compressed, but somewhat 

 flat and broad above. Depth in the length five. Head broad above, 

 pointed in front ; the interorbital space two and one-half times in the 

 length of the head. Snout a little longer than the remainder of the 

 head. Eye small, eight times or more in the length of the head. Head 

 in the length four and one-fourth to five time's. Mouth wholly inferior, 

 much overhung by the long snout ; the lower lip consisting of two large 

 flat lobes, which are furnished with coarse papillje. Dorsal rays ten, the 

 borders of the fin straight. Anal rays seven, reaching back to the 

 base of the caudal. Scales small, especially in front of the dorsal fin, 

 20-95 to 114-15, about forty-eight in front of the dorsal. Lobes of 

 the caudal equal and similarly colored. Upper surface of the body 

 smoky-gray, the lower white. Along the side from the head to the tail, 

 is a broad rosy band, below which is an obsolete brown band of about 

 the same width. This becomes quite distinct on the shoulder. Further 

 forward, on the sides of the head and on the snout, it becomes nearly 

 black, and contrasts strongly with the white of the upper lip and lower 

 half of the snout. The anal and the veutrals are reddish, the other fins 

 are dusky. Males in the spring said to be profusely tuber.culate on the 

 head and anal fin. Size large. 



Great Lakes and northward. Prof Jordan, in his ' Catalogue of the 

 Fishes of Illinois" (1^, No. 2), gives this species as belonging to Illi- 

 nois, and states that it is abundant in Lake Michigan. It is sometimes 

 seen in the markets of Chicago, and is a beautiful fisli in its spring dress. 

 Whether or not the ro-y lateral band is confined to the male, I do not 

 know. Dr. Bean {25, 25) says that it i-^. The fl'^'sh is rather soft and 

 full of fine and forked bones. 



