816 FISHES—CATOSTOMID.. 
directly into the cerebral cavity. The occipital process is below the anterior vertebra, 
enlarged into a bladder-like swelling, which is not solid, but consists of a delicate 
network only. The prefrontal is advanced to the anterior part of the orbit. The jaw- 
bones are very feeble, the intermaxillary being reduced to a thin lamella, which does not 
descend to the middle of the maxillary. The anterior part of the mandible is horizontal,,. 
thin and slightly dilated. The apophyses of the four anterior vertebra are very strong 
and long.”—(GUNTHER, Cat. Fishes Brit Mus., vii, 13 ) 
This genus as at present restricted comprises three well-marked groups, which may be 
accepted as subgenera, under the names Catostomus, Decadactylus, and Hypeniclium One 
of these groups, Hypentelium, has been considered as a distinct genus, on account of the 
differences in the form of the head and in the squamation. These differences are, how- 
ever, individually of subordinate value, and should probably be held to designate a sub- 
generic section, rather than a distinct genus. 
The genus Catostomus is, next to Myxostoma, the most rich in species. It is much the 
most widely distributed of the genera of Sackers, some of its members abounding in 
every river of North America, and one of them being found in Asia. Only three of them 
are found in Ohio. 
ANALYSIS OF SPECIES OF CATOSTOMUS. 
*Scales much crowded and reduced in size anteriorly. 
t Scales very small, about 100 in lateral line. (Subgenus Catostomws.) 
LONGIROSTRIS. 38. 
tt Scales median, 65 to 85 in the lateral line. (Subgenus Decadactylus.) TERES, 39. 
**Scales not crowded, nearly equal over the body, 48 to 50 in the lateralline, (Sub- 
genus Hypentelium.) : : 5 : 4 : . i NIGRICANS. 40. 
38. CATOSTOMUS LONGIROSTRIS LeSueur. 
Long-nosed Sucker; Northerm Sucker; Red-sided Sucker. 
Cyprinus catostomus, FORSTER, Philos. Trans., Ixili, 1773, 145, tab. 6.—SCHNEIDER, ed. 
Bloch., 1802, 444. 
Catostomus longirosirum, LESuEUR, Journ. Acad. Nat. Sci Phila., 1817, 102.—THoMPsoN, 
Hist. Vt., 1842, 135.—Cuvier and VALENCIENNES, xvii, 1844, 453.—SToRER, Synopsis, 
1846, 421.—JORDAN and COPELAND, Check List, 1876, 156. . 
Catostomus longirostris, DEKay, New York Fauna, part iv, Fishes, 1841, 203.—JoRDAN 
and GILBERT, in Klippart’s Rept., 1877, 54.—JorDAN, Bull. U.S. Nat. Mus., xii, 1878, 
175. 
Catostomus hudsonius, LESUZUR, Journ. Acad. Nat Sci. Phila., 1817, 107.—CuvieR and 
VALENCIENNES, Hist. Nat. des Poissons, xvii, 1844, 459.—SrorER, Synopsis, 1846, 
419.—AgGassiZ, Am. Journ. Sci. Arts, 2d series, xix, 1855, 208.— GUNTHER, Cat, Fishes 
Brit. Mus., vii, 1868, 13.—JORDAN, Man. Vert., 1876, 293.—NELsoN, Bull. No. 1, Ils. 
Mus. Nat. Hist., 1876, 48. 
Catostomus forsterianus, RICHARDSON, Franklin’s Journal, 1823, 720; Fauna Bor.-Amer., 
iii, Fishes, 1836, 116.—DrKay, New York Fauna, partiv, Fishes, 1842, 203.—CUVIER 
and VALENCIENNES, Hist. Nat.des Poissons, xvii, 1844, 463.— STORER, Synopsis, 1246, 
419.—PuTNAM, Bull. Mus. Comp. Zool., 1863, 10.—JoRDAN and COPELAND, Check 
List, 1876, 156. 
Acomus forsterianus, GIRARD, Proc. Acad. Nat. Sei. Phila., 1856, 172. 
