816 FISHES — CATOSTOMID^. 



directly into the cerebral cavity. The occipital process is below the anterior vertebras, 

 enlarged into a bladder like swelling, which is not solid, bnt 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 vertebrio are very strong 

 and long."— (GUNTHEK, Cat. Fishes Brit Mas., vir, 13 ) 



This genus as at present restricted comprises three well-marked groups, which may be 

 accepted as subgenera, under the names Catostomm, Deeadaotylas, and Hypeninlium Ooe 

 of these groups, Bypenteliiim, has been considered as a distinct genus, on account of the 

 differences in the form of the head and in the equamation. 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 genns Catosiomus is, next to Myxostoma, the'most rich in species. It is much the 

 most widely distributed of the genera of Suckers, some of its members abounding in 

 every river of North America, and one of them being found in Asia. Only three of them 

 are fonnd in Ohio. 



Analysis of species of Catostomus. 



•Scales much crowded and reduced in size anteriorly. 

 t Scales very small, about 100 in lateral line. (Sabgenus Catoatnmus.) 



LONGIROSTKIS 38. 



tt Scales median, 65 to 85 in the lateral line. (Subgenus Decadacti/lus.) teres. 39. 

 "•Scales not crowded, nearly equal over the body, 48 to 55 in the lateral line. (Sub- 

 geiius Hypentelium.) . nigricans. 40. 



38. Catostomus longirosteis LeSueur. 



Long'-noseil Sucker; Northern SucUer; Red-sided Sucker. 



Cyprinus catostomus, Foester, Philos. Trans., Ixiii, 1773, 145, tab. 6. — Schneider, ed. 



Bloch., 1802, 444. 

 Catostomus longirostrum, LkSdeur, Jonrn. Acad. Nat. Sci Phila., 1817, 102. — Thompson, 



Hist. Vt., 1842, 135. — CuviERand Valenciennes, xvii, 1844, 453.— Storer, Synopsis, 



1846, 421. — Jordan and Copkland, ChsokList, 1876, 156. 



Catostomus longirostris, DkKay, New York t'auna, part iv, Fishes, 1841, 203. — Jordan 



and Gilbert, in Klippart's Kept., 1877, 54.— Jordan, Bull. TJ. S. Nat. Mus., xii, 1878, 

 175. 



Catostomus hudsonius, LeSttbur, Journ. Acad. Nat Sci. Phila., 1817, 107. — Covibr and 

 Valenciennes, Hist. Nat. des Poissons, xvii, 1844, 459. — Storer, Synopsis, 1816, 

 419.— Agassiz, Am. Jonrn. Sci. Arts, 2d series, xix, 1855, 208. — Gunther, Cat. Fishes 

 Brit. Mus., vii, 1868, 13.— Jordan, Man. Vert., 1876, 293.— Nelson, Bull. No. 1, Ills. 

 Mus. Nat. Hist., 1876, 48. 



Catostomus forsterianus, Eichardson, Franklin's Journal, 1823, 720 ; Fauna Bor.-Amer., 

 iii, Fishes, 1836, 116.— DbKay, New York Fauna, partiv, Fishes, 1842, 203. — Cuvibk 

 and Valenciennes, Hist. Nat. des Poissons, xvii, 1844, 463. — Storer, Synopsis, 1846, 

 419.— Putnam, Bull. Mus. Comp. Zool., 1863, 10. — Jordan and Copeland, Check 

 List, 1876, 156. 



Acomus forsterianus, Girard, Proc. Acad. Nat. Sci. Phila., 1856, 172. 



