] 90 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



CijcUpius elongattts Jordan, Fishes of Ind. 222, 1875. 



Cydeptus eloinjaliis Johdan, Bull. Buffalo Soc. Nat. Hist. 95, 1876. (Name only.) 

 Cycleptus elongatus Jordan, Man. Vert. 298, 1876. 

 Cydeptus elongatus Nelson, Bull. No. 1, Ills. Mus. Nat. Hist. 50, 1876. 

 Cydeptus dongatus Jordan & Copeland, Check List, 158, 1876. (Name only.) 

 Cydeptus elongatus Jordan & Gilbert, in Klippart's Kept. 53, 1876. (Name only.) 

 Cydeptus elongatus Jordan, Bull. U. S. Nat. Mus. ix, 33, 1877. 

 Cydeptus elongatus Jordan, Man. Vert. ed. 2d, 1878. 

 1818— Cydejit us nigresceus Rafinesque, Journal de Physique, 421. 

 Cydeptus nigrescens Rafinesque, Ich. Oh. 61, 1820. 



Habitat. — Mississippi Valley, in all the larger streams. 



This species is fouud in some abundance in the larger streams. At 

 the Falls of the Ohio, it is taken in nets, and meets a ready sale. It is, 

 however, much less abundant than the Buffalo fishes are. From the 

 general use of the name '^Missouri Sucker", its abundance in the State 

 of Missouri may be inferred; but, as to the facts in the case, I am not 

 informed. This fish is as sharply distinguished from the other Suckers in 

 its appearance as in its anatomy. The dusky colors and the small size 

 of the head attract attention at once. 



But one species is yet known. That being the case, the synonymy of 

 the species needs no discussion, its oldest name being the one in com- 

 mon use. 



Spedmens in United States National Museum. 



Genus CARPIODES Bafinesque. 



Carpiodcs Rafinesque, Ich. Oh. 56, 1820. (As subgenus of tSatostomus.) 

 Sdcrognathus Valenciennes, Hist. Nat. des Poissons, xvii, 472, 1844. 



Type, Catostomus cyprinus Le Sueur. 



Etymology, Latin carpio, a carp ; i, e., carp-like. 



ETead comparatively short and deep, sometimes conic, sometimes 

 blunt, its length ranging from 3^ to 5 in that of the body, its upper 

 surface always rounded ; eye moderate, median or anterior in position ; 

 suborbital bones well developed, their depth more than half that of 



