21G CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY— IV. 



aud most distiuct posteriorly ; a dusky baud on head, through eyes and 

 snout; fins plam. Head 4^; dei)th 5|^. D. 8; A. 7; scales 6-47-5 ; 

 teeth 4-4, often with slight grinding surface. L. 5 inches. Ohio Val- 

 ley and tributaries of the Great Lakes. 



{Leucisciis (lissimiUs Kirtkmd, Bost. Jouni. Nat. Hist, iii, 341, 1840: CcratichtJiys dis- 

 iimilis Cope, Cypr. Penn. 367 : Cerafichthys dissimiUs Giinther, vii, 177.) 



335. €. sterBeUis Cope. 



Body slender, with long caudal peduncle, the least depth of which is 

 little more than a third of the greatest depth of the body. Head long 

 and slender, the muzzle much projecting and broadly rounded. Mouth 

 moderate, inferior, the maxillary not reaching the front of orbit. Bar- 

 bels conspicuous. Eye moderate, 4.^ in head. Fins rather long, the 

 caudal deeply forked. Color silvery; sides with a few dusky scales; 

 forehead pink in the males, as in C. rubrifrons. Head 4; depth 4|. D. 

 8; A. 7 ; scales 6-30-5 ; teeth 4-4. Rio Grande, in New Mexico. {Cope.) 



(Cope, Zool. Wheeler's Expl. W. lOOth Mer. v, 632, 1876.) 



336. C. aestivalis (Grd.) Cope. 



Head contained about 4^ times in the total length. Differs from G. 

 gelidus and G. cenialis, its American congeners, by a rather comjiressed 

 body, elevated aud arched upon its middle region, aud tapering rapidly 

 towards the peduncle of the tail. The snout is more i^rotrudiug than 

 in G. gelidus, the eye larger, and the ventral fins inserted somewhat 

 more forwards. The scales are also larger (about 36 in the lateral line 

 in the figure), deeper than long, anteriorly subtruncated and posteriorly 

 rounded, with radiating furrows upon the latter section only. D. I, 8; 

 A. I, 7, etc. The color is yellowish brown, somewhat lighter beneath 

 than above, with a silvery streak along the middle of the flanks. Eio 

 ISau Juan, Cadareita, New Leou. ( Girard.) (Of course these little fishes 

 have no intimate relation with the European genus Gobio, which is an 

 ally of Seniotilus, with the teeth 3, 3-5, 3, and the barbel lateral and 

 very long.) 



(Gobio W'ith-aUs OiniYd, Proc. Acad. Nat. Sui. Phila. 18.56, 189.) 



33'S'. €. J^elictiis (Grd.) Jor. 



Body very slender, not elevated. Head slender and elongate, the 

 snout promineut and tapering. Eye small, rather high, 4 in head. 

 Mouth small, subterminal, the maxillary not extending to the eye. 

 Fins large. Lateral line decurved. Scales rather large. Coloration 

 silvery; a dusty lateral streak, and a blackish spot at base of cauda.L 



