210 Bulletin 47, United States National Museum. 



caudal long. Scales quite small, firmly attached, but not much imbri- 

 cated. Lateral line developed less than half the length of the body. 

 Color brownish olive, with a dusky dorsal line and often some blackish 

 spots ; two black lateral bands nearly parallel, the one from the upper- 

 angle of the opercle straight to the caudal, sometimes broken into spots 

 behind, the lower broader, extending from snout through eye, curved 

 downward along the belly and extending to the caudal, where it ends in 

 a black spot ; between these bands a bright, silvery area ; belly below 

 the lower band abruptly silvery ; females obscurely marked. Males in 

 spring with the belly and the interspace between the lateral bands bright 

 scarlet; bases of the vertical fins also scarlet; in high coloration the 

 body is everywhere minutely tuberculate and the fins are bright yellow. 

 Length 2 to 3 inches. Ohio and Michigan to Iowa and Northern Ala- 

 bama ; also common at Freeport, Maine, (Kendall and Smith.) Abundant 

 in small clear streams; one of the most beautiful of our fishes, especially 

 attractive in aquaria, (tpvdpoc;, red; yacrr^p, belly.) 

 Luxilus or Chrosomus erjjthrogasler, RAFINESQUE, Ichth. Oh., 47, 1820, Ohio River. 

 Chrosomus pyrrhogaster, JORDAN, Man. Vert., Ed. 1, 284, 1876, White River, Indiana. (Coll. 



Jordan.) 



Luxilus erythrogaster, KIRTLAND, Bost. Jonrn. Nat. Hist., iv, 23, 1844. 

 Leuciscus erythrogaster, GUNTHER, Cat., vn, 247, 1868. 

 Chrosomus erythrogaster, JORDAN & GILBERT, Synopsis, 153, 1883; COPE, Cypr. Penn., 391, 1868. 



Represented in the Susquehanna River by 



334a. CHROSOMUS ERYTHROGASTER EOS (Cope). 



Head 4; depth 5. D. 8; A. 8. Lateral line 77; teeth 5-5. Body slen- 

 derer than the preceding; the lateral line less distinct, often entirely 

 wanting. Male with the two black lateral bands uniting on the caudal 

 peduncle, the lower broader and decurved, the upper narrow and 

 straight. Length 2| inches. Susquehanna River. (??, sunrise.) 



Chrosomus eos, COPE, Proc. Ac. Nat. Sci. Phila., 1861, 523, Meshoppen Creek, Susquehanna 

 County, Pennsylvania ; COPE, Cypr. Penn., 391, 1868 ; JORDAN & GILBERT, Synopsis, 154, 

 1883. (Coll. Cope.) 



335. CHROSOMUS DAKOTENSIS, Evermann & Cox. 



Head 3f ; depth 4i ; eye 3i ; snout 4|. D. 8 ; A. 8 ; scales about 80, 24 

 in a cross series ; teeth 4-4, with slight grinding surface. Body moder- 

 ately stout, head heavy, caudal peduncle shorter than in related species. 

 Eye moderate ; interorbital width 3 in head. Mouth small and oblique ; 

 maxillary short, not nearly reaching vertical at front of eye, its length 

 1 in eye; lower jaw projecting; fins moderate; height of dorsal 1| in 

 head, its origin behind the base of ventrals a distance greater than 

 length of snout ; anal similar to dorsal ; pectorals short, li in head ; 

 ventrals very short, not reaching anal. Color as in C. erythrogaster, 

 except that the back is darker and the upper dark line is continuous and 

 not at all broken up into spots; the lower black line is more distinct, 

 broader, and does not end in a black spot. Length 2 inches. Missouri 

 River basin, in Nebraska and South Dakota. 



Chrosomus dakotewis, EVERMANN & Cox, Kept. U. S. Fish Comm., xix, 1895, Crow Creek, 

 Chamberlain, South Dakota. (Type, No. 45680. Coll. Evermann, Rutter, & Cox.) 



