1G8 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY — IV. 



all plain, nead 4; depth 5. Scales 5-36-4; teeth 4-4. L. 2J inches. 

 Ohio Valley and lake region; generally abundant in small streams. 

 One of the most insignificant of all our fishes. 



(Hijhofjnatlms stmmincm Cope, Proc. Acad. Nat. Sci. PMla. 1864, 283: HijlopHis stra- 

 minens Coj)e, Cypr. Peuu. 381.) 



2iO. C. voiMceBBa (Cope) J. & G. 



Body moderately stout. Head depressed, elongate, the vertex plane, 

 the muzzle elongate. Fins more elongate than in most of the related 

 species, the pectorals reaching the ventrals. Caudal peduncle slender. 

 Eye 3^ in head. Olivaceous, a slight dusky lateral shade; no dorsal 

 stripe; fins plain. Head 3f ; depth 4. D. 8; A. 8 ; scales 4-34-3; 

 teeth 4-4. L. 2^ inches. Michigan and Wisconsin. 



(Hybognathus i^olucellus Cope, Proc. Acad. Nat. Sci. Phila. 1864, 283: Rij'bojjsis volu- 

 celhis Cope, Cypv. Peuii. 381: Leuoiscus vohictlltis Giinther, vii, 260.) 



211. C. iiiica'OStOMia (Raf.) J. & G. • 

 Body elongate, the caudal peduncle not contracted. Mouth inferior, 



horizontal, small, the maxillary not reaching the line of the eye. Fins 

 rather short. Eye large, 3J in head. Fourteen scales before dorsal. 

 Preorbital bone much longer than deep. Olivaceous, translucent ; a sil- 

 very lateral band, along which is a black speck at the origin of each 

 tube of the lateral line. D. 8; A. 7; scales 5-33-2; teeth 4-4. L. 2^ 

 inches. Virginia to Kentucky. 



{Miimilus microstomus Raf . Ichtli. Oli. 1820,47: Hijhopsislongiceps Co\}Q, Joum. Acad. 

 Nat. Sci. PMla. 1888, 231.) 



212. C fliBBeoBatfa (Agassiz) J. & G. 



Body slender. Head short. Muzzle obtuse. Mouth slightly oblique, 

 the jaws equal, the maxillarj^ reaching to eye. Lateral line slightly de- 

 curved. Olivaceous, sides silver^', with dark points along the lateral 

 line, these especially abundant along the sides of the muzzle. Head 

 4i ; depth 4f . 13. 8 ; A. 7 ; scales G-34-4 ; teeth 4-4. L. 2 inches. 

 Nebraska to Colorado. {Cope.) Osage Eiver. (Agasaiz.) 



{Alhnrum lineolatus Agasssiz, Bull. Mas. Coiup. Zool. 1863,9: Leuciscus llncolatus Giiu- 

 tlier, yii, 200 : Ui/bopsis scylla Cope, Haydeu's Geol. Surv. Wyom. 1872, 4:58.) 



213. C. BMassMracDBSis (Cope) J. & G. 



Body stout, with large head and thick caudal peduncle. Mouth sub- 

 inferior, somewhat oblique, end of maxillary reaching line of orbit. 

 Twelve scales in front of the dorsal fin. Fins rather long. Eye large, 3 

 in head. Coloration very pale olivaceous; a silvery lateral band and 

 some dusky specks at base of caudal; no dark dorsal line; fins plain. 



