12G CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



than one-third tin- head. Coloration silvery; the males probably rosy 

 and tiibriviilate in spring. C.ila region to Wyoming; iiot abundant. 



, r..:ird vV <;iiar.l. I'm.-. A. -id. Nat. Sci. Phila. 1853, 3 J ?; Giiuth/r, vii, 14 ; Jordan, 

 I.e. i: : - ' nix i/ii:inti,iit MMV Girard,Proc. Acad. Nat. Sci.Phila. 1856,173.) 



131. $'. EvJ!roii:i:n:s .Ionian. 



liody Ion-- and slender, subterete, compressed behind, the form es- 

 sentially that of ('. loii'jiroHtrix, the depth contained 5t times in the 

 length. Head large, I in length of body, the interorbital space broad 

 and llat. 1'.'. in length of head. Eye small, high up and rather posterior. 

 1'ieorbital bone very Ion-- and slender, its length about ."> times its 

 depth. Month large, precisely as in C. latipinnii, the upper lip pendent, 

 very large. with .~-8 series of tubercles. Dorsal (in not elongated or 

 e>pe.-ially elevated, its rays 11, the beginning of the dorsal much nearer 

 base of caudal than snont. Caudal fin Ion-- and strongly forked. Anal 

 tin long and high, reaching base of caudal. Ventrals not reaching vent. 

 Caudal peduncle stout and deep, its least depth more than one-third 

 length of head; its length about two-thirds that of head. Scales quite 

 small, about as in towr/i'ms/m, the exposed portion not notably length- 

 ened. Chest with well-developed scales. Scales 1( {-100-1-1. Colora- 

 tion dusky brown, a dusky lateral band, pale below, the dark colors ex- 

 tending low. Snout quite dark. Size large. Montana to Nebraska. 



(Jordan, Lc. 17-.) 



/-.'.. l"|i|i r lip roinpara'iyrly Him and narrow, vulh lint tVw (:i or -I) VO\VH of papilla'. 



132. C. lonpfiirostrns L<' Sucur. f.(>ii<i-ux:il Sucker; \<-Hn'rn 



I'.ody elongate, snbtei-ete, the de]th 1',-lj in length. Head quite 

 loiigand sleiidei-, 1 ',-!'.; in length, depressed and tlattened abo\c, broad 

 at ba-e. lint tapering into a long snont, which considerably overhangs 

 the large month. laps thick, coarsely tnbereulate. the upper lip nar- 

 row, \\ith - or .". rows ol tubercles. Kye rather small, behind the mid- 

 dle of the head. Scales very small, much crowded forwards, 0.1-111 in 

 the course of the lateral line, and about L'!l iJii-IJl) in a cross-row from 

 dorsal to ventrals. Dorsal rays 10 or 11. Males in spring with the head 

 and anal I'm profusely tubercn late, the tubercles on the head small ; 1 he 

 sides at that lea "ii with a broad rosy band. Si/.e large; the largest 

 in t lie genus. C.reat bakes and Cjipt-i 1 Mississippi Valley to 



' Tlii* is protialily a <li>liin-t spn-ifs. It is slimier than C. lulifiiiniix. with shorter 

 and deeper caudal peduncle and lower fins. A blackish lateral baud. I>. 1'.'; Lai. 1. 



"'. l'p]icr lip \\ilh 1 |-i:\\s of papilla'. Tlir original type from Lakr (Jii/man, 

 ( 'liiliu.ilina. i> now l"-t. 



