138 CONTRIBUTIONS TO NORTH AMERICAN ICriTIIYOLOGY IV. 



Color silvery; back with smoky shading; lower fins white. Size large; 

 reaches a length of about 3 feet. North Carolina to Georgia. 



(PtijchosfomKS jyapUlosas Co\W', Proc. Amer. Pliil. Soc. Pbila. 1870,470; Jordau, Man. 

 Vert, 318; Jordan, Bull. U. S. Nat. Mus. xii, 134.) 



** Lips distinctly plicato. 



t Lower lip ijifolded, /^-sliaped when viewed from below, witli a distinct median 

 crease, in "wiiich tlio two halves of the lip meet, forming an acute angle; 

 mouth small. 

 a. Dorsal large, with 15-17 developed rays. 



153. M. velatMBBl (Cope) Jordan. 



Body stout, deep, comi^ressed, the back elevated, the depth 3-4 in 

 length. Head short, heavy, flatfish and broad above, 32-4^ in length. 

 Depth of cheeks half the length of the head. Eye rather large, midway 

 in head, 4-5 in its length. Muzzle rather prominent, blnntish, over- 

 hangi ng tlie very small mouth. Fins very large. Dorsal long and liigh, 

 its height five-sixths the length of the head, its free border straight. 

 Pectorals nearly reaching ventrals. Color silvery; smoky above; lower 

 fins red. Size large. Upper Mississippi Valley to Georgia and south- 

 ward. 



{Ptijchosiomns velatus and collapsus Cope, Proc. Amer. Phil. Soc. Phila. 1870, 471-472; 

 Jordau, Man. Vert. 317; Jordan, Bull. U. S. Nat. Mus. xii, 132.) 



aa. Dorsal moderate, -with 12-14 developed rays. 



1). Head comparatively large, about 4 in length; dorsal raj's usually 12. 



154. ITI. bucco (Cope) Jordau. 



Head short and very wide through the' opercles, flat above. Body 

 stout, the back somewhat elevated, depth 4 in length. Muzzle sub- 

 truncate, slightly projecting. Scales C-40-5. Olivaceous silvery be- 

 low; dorsal fin duskj". Kansas. {Cope.) 



(Ptychostomits hucco Cope, Hayden's Gcol. Surv. Wyom. 1872, 437: Mijxostoma con- 

 gestum Jordan, Bull. U. S. Nat. Mus. xii, 133; probably not Catostonius congesfiis B. & 

 G. Proc. Acad. Nat. Sci. Phila. 1854, 27, which Professor Cope thinks is a form of M. 

 macroJepldotum, he having obtained it in Texas and xirizona.) 



155. M. pidiense (Cope) Jordan. 



Head rather long, 4J in length, flattish above. Body elongate, more 

 nearly cylindrical, little compressed. Muzzle truncate. Olivaceous, 

 sometimes with rows of faint spots along the series of scales. Dorsal 

 and caudal fins black-edged. Size quite small, llesembles M. cervi- 

 iium, but the mouth entirely diflcrent. Great Pedee liiver. (Cope.) 



{Ptiichostomus pidiensis, Proc. Am. Phil. Soc. Phila. 1870, 471: Jordau, Man. Vert. 

 317; Jordan, Bull. U. S. Nat. Mus. xii, 133.) 



ib. Head very small, about 5 in length. 



