198 Bulletin 47, United States National Museum. 



324. PLACOPHARYNX DUQUESNII, (Le Sueur). 



Head 4; depth 3. Scales 6-45-6. Dorsal rays 12 or 13; ventral 9. 

 Body oblong, moderately compressed, heavy at the shoulders. Head 

 large, broad, and flattish above, its upper surface somewhat uneven. Eye 

 small, behind the middle of the head. Mouth large, the lower jaw oblique 

 when the mouth is closed, the mouth, therefore, protractile forward as well 

 as downward. Lips very thick, coarsely plicate, the lower lip full and 

 heavy, truncate behind. Free edge of dorsal concave, the longest ray 

 longer than base of fin, 1 in head; upper lobe of caudal narrower than 

 lower and somewhat longer. Color dark olive green, the sides brassy, 

 not silvery ; lower fins and caudal orange red. L. 30 inches. Michigan 

 (Detroit) to Tennessee, Georgia, and Arkansas; abundant in the larger 

 streams, especially in the French Broad and in the Ozark region. (Named 

 for Fort Duquesne, now Pittsburg.) 



Catostomus duquemii* LE SUEUR, Jour. Ac. Nat. Sci. Phila., i, 1817, 105, Ohio River at Pitts- 

 burg, Pennsylvania. 



Placopharynx carinatus, COPE, Proc. Am. Phil. Soc. Phila., 1870, 467, Wabash River. 

 Placopltarynx carinalus, JORDAN, Bull. TJ. S. Nat. Mus., xn, 108, 1878. 

 Placopharynx carinatus, JORDAN & GILBERT, Synopsis, 142, 1883. 



99. LAGOCHILA,t Jordan <& Brayton. 

 (RABBIT-MOUTH SUCKER.) 



Lagochila, JORDAN & BRAYTON, Proc. Ac. Nat. Sci. Phila., 1877, 280, (lacera); name similar to 



Lagocheilus, a genus of niollusks. 

 Quassilabia, JORDAN & BRAYTON, Man. Vert. E. U. S., Ed. 2, 1878, 401, (lacera)- substitute for 



Lagochila, regarded as preoccupied. 



Suckers like Moxostoma in every respect excepting the structure of the 

 mouth. Head shortish, conical, with lengthened snout; the opercular 

 region short, so that the eye is well backward. Suborbital bones nar- 

 row. Fontanelle large, widely open. Mouth large, singular in structure, 

 inferior, the upper lip not protractile, greatly prolonged, closely plicate ; 

 lower lip much reduced, divided into 2 distinct elongate lobes, which 

 are weakly papillose ; the split between these lobes extends backward to 

 the edge of the dentary bones, which are provided with a rather hard, 

 horny plate ; the lower lip is entirely separated from the upper at the 

 angles by a deep fissure ; the skin of the cheeks forms a sort of cloak over 

 this fissure, the crease separating this skin from the mouth extending up 



*C. Diiqiiesnii. "Head largo and long ; mouth wide; scales large, subtrilobate ; dorsal fin quad- 

 rangular ; the anal fin extends as far as the base of the caudal fin, which is greatly forked ; lateral 

 line arched at the center of the body. Body loner, a little compressed ; snout strong; the mouth 

 is furnished with thick, plicated, and very large lips; pectoral fins pretty large ; the scales arc 

 strong, greatly radiated, and as wide again as long they are of nearly an equal size on the whole 

 body; the lateral line forms a long curvature toward the back ; lobes of the caudal fin pointed, the 

 upper lobe somewhat the largest ; length from the snout to the extremity of the caudal fin 19 

 inches ; depth 3^2 inches; thickness 2 inches; the head measures about part of the whole fish. 

 P. 17. D. 14. V. 10. A. 9. C. 18| rays. This new species is so strongly marked that it will 

 be easily distinguished from the foregoing. It inhabits the Ohio, and was discovered at Pittsburg, 

 the ancient Fort Duquesne, by Mr. Thomas Say." Le Sueur. 



The name dwiuemii has been usually applied to the common red horse, but the description 

 applies much better to the species of Placophanjnx. 



t By the rules of the American Ornithologists' Union, Qua*silabia would be preferred to Lago- 

 chil<i, on account of the similarity of the latter to Lagocheilus. As the two words are spelled 

 differently, we regard them as distinct. 



