860 FISHES—CYPRINID.&. 
ANALYSIS OF SPECIES OF CRRATICHTHYS. 
*Mouth subinferior; scales large, about 36 in lateral line; eye very large; silvery 
(subgenus Hybopsis). d ° . : 4 : AMBLYOPS. 8&7. 
**Mouth terminal ; scales mediaom, about 41 in lateral line; eye moderate; not 
silvery (subgenus Ceratichthys). : : : : : BIGUTTATUS. 82. 
81. CERATICHTHYS AMBLYOPS (Rafinesque) Girard. 
Big-eyed Chub. 
var. amblops. 
Rutilus amblops, RAFINESQUE, Ich. Oh., 1820, 51. 
Ceratichthys amblops, GIRARD, Proc. Acad. Nat. Sci. Phila., 13° 6, 213.— —JORDAN, Man. 
Vert., 2d Ed., 306. 
Nocomis amblops, JORDAN, Ann. Lyc. Nat. Hist. N. Y., 1876, 328. 
var. gracilis. 
Hybopsis gracilis, AGassiz, Amer. Journ. Sci. Arts, 1854, 358.— JORDAN, Ann. Lyc. Nat. . 
Hist N. Y., 1876, 331. 
Gobio vernalis, GIRARD, Proc. Acad. Nat. Sci. Phila., 1856, 168; U. S. Pac. R. R. Surv., 
1858, 249. | 
Hybopsis winchellt, GIRARD, Proc. Acad. Nat. Sci. Phila., 1856, 211. 
Nocomis winchelli, JORDAN, Ann. Lyc. Nat. Hist., 1876, 330. 
Ceratichthys winchelli, JORDAN, Man. Vert., 2d Ed., 306. 
Ceratichthys hyalinus, Corr, Journ. Acad. Nat. Sci., Phila. ; 1868, 236 —GUNTHER, Cat. 
Fishes Brit. Mus., vii, 179, and of authors. 
Descriptien.—Body moderately elongate, little compressed, heaviest anteriorly ; head | 
large, the muzzle rather long, the profile very blunt; eye unusually large, larger than in | 
most of our minnows, its diameter about one-third the length of the side of the head; 
mouth rather small, inferior, horizontal; barbels well developed ; fins moderate, the 
dorsal inserted over the base of the ventrals; scales large; color translucent above, . 
sides and below bright silvery ; a plumbeous lateral band, sometimes faint, sometimes 
shining blackish ; top of head and a streak through the eye dark; no vertebral band ; 
fins unspotted ; males in spring not tuberculate and without red markings ; head 4; 
depth 4%; scales 5-40-3; D.8; A. 8; pharyngeal teeth 1, 4-4, 1. Length 3 inches. 
Habitat, Mississippi Valley. Var. gracilis, Tennessee and southwards. — 
Diagnosis —This species may be known by the presence of a very 
large eye in connection with the ae barbels and ee See 
scales. 
Habits.—This species is abundant in all tributaries of the Ohio River. 
It frequents clear sandy or gravelly streams, and seeks the river chan- 
nels rather than the small brooks. The male in spring, so far as known, 
never becomes tuberculate, and the fins are never red, characters which 
help to distinguish this species from its ornate southern relative, 
Ceratichthys rubrifrons. | : 
