2(S COKTEIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY .1. 



therefore an Erimyzon and not a '•^ Ptycliostomus^\ Both E, oUlongug 

 and E. melanops abound in the lakes as well as in the Ohio. They are 

 much more tenacious of life than the other Suckers. The description of 

 Cyprinus sucetta Lac^pede {Caiostomus suceti 0. & V.) seems to refer to 

 this species. I therefore have adopted the prior name sucetta in prefer- 

 ence to that of melanops. 



The "lateral line" alluded to by Kafinesque here, as in numerous 

 other instances, is merelj^ a lateral streak along the rows of scales, either 

 due to longitudinal furrows or else to peculiarities of coloration. 



*61st species, Black-back Sucker, CATOSTOMUS MELANOTUS, Ca- 

 tostome melanote. (p. 58.) 



1 Campostoma anomalum (Raf.) Ag. 



The " nine dorsal rays" indicates a Cyprinoid, and the only species 

 found at the Falls of the Ohio which at all answers this description are 

 the Noco7nis biguttatus and Campostoma anomalum. It is best to iden- 

 tify it with the latter, and thus to avoid a change of names. 



t62d species, Rough-liead Sucker, CATOSTOMUB FAr3CIOLARIS, Ca- 

 tostome fascie. (p. 58.) 



Erimyzon oblongus (Mitch.) Jor. 



Moxostoma ohlongum (Mitch.) Ag. 



Description indifferent, "from a drawing by Mr. Audubon". The 

 tuberculated snout indicates a spring male of oblongus, rather than ni- 

 gricans, to which Professor Agassiz refers Eafinesque's description. 



* Diameter oue-sixtb of the length ; bluish black above, whitish beneath ; bead con- 

 vex, suont obtuse ; lateral line straight; dorsal and anal fins witb nine rays. 



Seen only once at the falls. Length 6 inches, body nearly cylindrical. Mouth 

 rather inferior, lips thick and somewhat gristly. Iris silvery. Scales pretty large. 

 Fins whitish, the dorsal and caudal a little reddish. Pectoral fins elliptical with 16 

 rays. Tail 20. Dorsal fin trapezoidal, opposed to the abdominal, the first ray shorter. 

 Anal elliptical obtuse. Vulgar names. Black Sucker and Blue Sucker. 



t Diameter one-sixth of the length; brown above, white beneath, sides with small 

 transversal black lines; head sloping, tuberculated above, snout obtuse; dorsal fia 

 longitudinal reaching the end of the anal fin, lateral line straight. 



I have uo'j seen this species, but des^ciibe it from a drawing of Mr. Audubon. It is 

 found in the lower part of the Ohio. Vulgar names: Rough-head Sucker, Pike-Sucker, 

 Stiipcd Sucker. Length about eight inches, body cylindrical tapering behind. Eyes 

 small, month beneath. Lower fius trapezoidal, about twenty transversal lines. A 

 doubtful species, perhaps an Ri/diargyrus, but the mouth is like that of the Sucker. 



