140 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



ured. As for the expression, u brown spots at the base of the scales," 

 if really originating with Bosc, as appears to be the case, it may have 

 ariseu*from the confusion of sucetta with melanops, which species inhab- 

 its the same waters, or it may simply refer to the obscure duskiness of 

 the bases of the scales, common to both species. 



I have examined many specimens of Minytrema melanops from the 

 Great Lakes, from various places in the Mississippi Valley, and from the 

 Tennessee, Alabama, Santee, and other Southern rivers, and can find 

 no differences of any importance. Indeed, the species seems to be very 

 little variable for one so widely distributed. 



Specimens in the "United States National Museum. 



Genus ERIMYZON Jordan. 



Moxostoma AGASSIZ, Am. Journ. Sc. Arts, 1854, 200. (Not of Rafinesque.) 

 Erimyzon JORDAN, Bull. Buff. Soc. Nat. Hist. 1876, 95. 



Teretulua COPE, Synopsis of Fishes of N. C. 2d ed. Addenda, 1877. (Not cf Rafiuesque.) 

 Cyprinus, Catostomus, and Labeo sp., EARLY AUTHORS. 



Type, Cyprinus oblongus Mitchill = Cyprinus sucetta Lac. 



Etymology, ipi, an intensive particle ; [j.v&, to snck. 



Head moderate, rather broad above : mouth moderate, somewhat in- 

 ferior> the upper lip well developed, freely protractile, the lower moder- 

 ate, infolded, ^-shaped in outline, plicate, with 12-20 plica3 on each 

 side: lower jaw without cartilaginous sheath, rather stronger than usual, 



