18 CYPEINID-=E. 



and about two-ninths of the total (without caudal) . Lips papillose, 

 the lower much thicker thau the upper, and slightly bilobed. Eye 

 small, situated behind the middle of the length of the head, the snout 

 being much j^roduced ; suborbitals very narrow. There are five and 

 a half longitudinal series of scales between the lateral line and the 

 root of the ventral fin. Scales on the fore part of the trunk equal 

 in size to those on the tail. Back and sides marbled with irregular 

 blackish-brown spots. 



Hivcrs "Wabask, Ohio, &c. 



a. Skin, 9 inches long. Ohio Canal. From Dr. Parnell's Collection. 

 6. Adult. Youghioghany River, Pennsylvania. Purchased of M^. 

 Salvin, 



11. Catostomus duquesnii. 



Catostomus duquesnii, Lesueiir, I. c. p. 105 ; Kirtland, Host. Journ. 

 Nat. Hkt. V. p. 268, pi. 20. fig. 1, pi. 2 1. fig. 2. 



ei'ythrurus, Rajinesque. 



Ptycliostomus duquesnii, Agassiz, I. c. 



D. 15. A. 8-9. L. lat. 43. L. transv. 61/8. 



The height of the body is nearly equal to the length of the head, 

 which is one-fourth of the total (without caudal). Lips broad, cor- 

 rugated, the lower slightly notched. Eye of moderate size, a little 

 behind the middle of the length of the head ; suborbitals very narrow. 

 There are four and a half longitudinal series of scales between the 

 lateral line and the root of the ventral fin. Scales on the fore part 

 of the trunk but little smaller than those on the tail. Upper margin 

 of the dorsal fin nearly straight, its origin being a little nearer to the 

 end of the snout than to the root of the caudal fin. 



United States (Ohio). 



a. Adult. Youghioghany River, Pennsylvania. Purchased of Mr. 

 Salvin. 



12. Catostomus macrolepidotus. 



Catostomus macrolepidotus, Lcsuew, I. c. p. 94 ; Cuv. <§• Val. xvii. 



p. 447 ; Dekay, New York Fauna, Fishes,-^. 202, pi. 77. f. 242. 

 Cyprinus (Catostomus) sueurii, Richards. Faun. Bor.-Amer. Pise. 



pp. 118, 303. 

 Catostomus aureolus, Dekay, ^. c. p. 201, pi. 42. f. 133 (not Lestmir). 



D. 15. A. 8-9. L. lat. 44-46. L. transv. 6|/8. 



The height of the body is contained thrice and two-thirds in the 

 total length (without caudal), the length of the head five times and 

 a half or six times. Upper lip thin, lower much thicker not bilobed, 

 both corrugated. Eye small, in the middle of the length of the head ; 

 suborbitals very narrow. There are four and a half longitudinal 

 series of scales between the lateral line and the root of the ventral 

 fin. Scales on the fore part of the trunk smaller than those on the 

 tail. Upper margin of the dorsal fin ~ - shaped, the anterior rays 

 being sometimes a little elongate. Air-bladder with three divisions. 



Northern parts of North America. 



