CHUB. 863 
Diagnosis.—From other large chubs with a barbel, this species may be 
‘known by the presence of two teeth in the lesser shai in the pharyngeals, 
Habits.—This species has thus far only been recorded from the Upper 
Lakes. It is probably not abundant in Lake Erie, and does not, so far as 
is known, ascend the streams. 
A closely related species (Couestus dissimilis), with the mouth larger 
‘and somewhat oblique, occurs in the Upper Lakes. 
Genus 42. SEMOTILUS. Rafinesque. 
Semotilus, RAFINESQUE, Ich. Oh., 1820, 49. 
Leucosomus, HECKEL, Russegger’s Reise, 1843, i, 1042. 
Cheilonemus, BaIRD, Storex’s, Fish. Mags. 1855, 288. 
| Type, Semotilus, Raf = Cyprinus corporalis, Mit. 
Etymology, sema, banner, ¢.¢e., dorsal fin; tilus, supposed by Rafineeque to mean 
spotted. 
Body robust; mouth terminal, the upper jaw protractile; a small barbel on the maxil- 
lary just above its end ; intestinal canal short ; teeth 2, 5-4, 2, hooked, without mastica- 
tory surface; scales moderate ; lateral line continuous; dersal more or less pesterior to 
ventrals; anal basis short; species of large size. This geaus differs from Telestes in the 
presence of a maxillary barbel; and from the European genus Gobdio in the presence of 
but two, instead of three, teeth in the lesser row. 
Bat three or four species are known, divisible into two well marked wubpentes 
Leucosomus.—Scales rather large, not crowded anteriorly ; dorsal nearly over ventrals, 
without black spot at its base. 
Semotilus.—Scales small, smaller and crowded anteriorly ; dorsal well behind ventrals, 
with @ black spot at its base in front. 
The single representative of Leucesomus, Semotilus bullarie (Raf.) Jor., the great Chub 
or Fall fish of Pennsylvania and the Eastern States may perhaps eccur in the eastern 
part of Ohio. This species is much the largest of the eastern Cyprinide, and may be 
known from S. corporalis, by the absence of the black dorsal spet, and by tke other 
characters noticed above. In the young of both species the barbel is usually too small to 
be appreciated. 
84. SEMOTILUS CORPORALIS (Mitchell) Erato, 
Chub; Horned Dace; Creek Chub; Smaller Fallefish. 
Cyprinus corporalis, MITCHILL, Am. Monthly Mag., ii, 1817, 289, and 1818, 324, 
Leuciseus corporalis, DEKayY, Fishes N. Y., 1842, 213. 
Semotilus corporalis, PUTNAM, Bull. M. C. Z., 1863, 8; in Storer’s Fishes Mass. , 206.—COPE, 
Cyp. Penr., 362, 1866; Prow Phil. Ne Nci., 1865, 85; Hayden’s Geol. Surv. Terr., 
1670, 442, and 1871, 472. —ABBOTT, Am. Nat., April, 1870, 12. —JORDAN, Ind. Geol. 
Surv., 1674, 223; Bull. Buff. Soc. Nat. Hist., 1876, 94; Man. Vert., 1876, 278, 
Bull. U. S. Mus., vi, 1876, 64; and of most late U. S. writers. 
Leucosomus corporalis, GUNTHER, Cat, Fishes, vii, 269. 
Cyprinus atromaculatus, MITCHILL, Am. Monthly Mag., ii, 1817, 324. 
Leuciscus giromecutaias, DrKay, Fishes m. ¥., 1842, 210.—Storer, Synopsis, 1846, 409, 
—Goopz, 
