30. CATOSTOMID^E MOXOSTOMA. 141 



blackisli at their bases ; lower fins white ; top of bead, humeral bar, and 

 dorsal fin dusky. Neuse Eiver, North Carolina. (Cope.} Probably 

 identical with the preceding. 



(Ptycliostomus crassttabris Cope, Proc. Amer. Phil. Soc. Phila. 18/0, 477 ; Jordan, Man. 

 Vert. 314; Jordan, Bull. U. S. Nat. Mus. xii, 125.) 



163. M. COBI&IS (Cope) Jordan. 



Body flattish, the dorsal outline elevated, the form being like that of 

 M. corcgonus. Head small and conic. Mouth exceedingly small, the 

 snout far overpassing it, the muzzle being much longer than in M. 

 crassilabre. Dorsal rays 14. Eye large. Coloration smoky above, some 

 scales dusky at their bases; sides pale; lower fins white. Yadkin 

 Eiver, North Carolina. (Cope.) 



(PtycJiostomus conns Cope, Proc. Amcr. Phil. Soc. Phila. 1870, 478 ; Jordan, Man. 

 Vert. 314 ; Jordan, Bull. U. S. Nat. Mus. xii, 126.) 



ff. Caudal fin with the upper lobe longer than the lower, the two similarly colored. 



164. I?I. asjBSOirtansi (Raf.) Jordan. 



Caudal fin with the upper lobe falcate, much longer than the lower, 

 at least in the adult, the lobes similarly colored. Dorsal fin short and 

 high, falcate. Body compressed. Back somewhat elevated. Depth 3J 

 in length. Head conic, fiattish, 5^- in length. Mouth very small, much 

 as in aurcolum, from which it can probably be distinguished only by the 

 form of the caudal. D. 12-13, half higher than long. Scales G-4G-5. 

 Ohio Valley and Great Lake region. 



(Catostomus anisurus Raf. Ichth. Oh. 54 : Ptycliostomus brericeps Cope, Proc. Ainer. 

 Phil. Soc. Phila. 1870, 478; Jordan, Man. Vert. 315; Jordan, Bull. U. S. Nat. Mus. xii, 

 126.) 



fff. Caudal fin with the lower lobe distinctly longer than the upper and differently 

 colored, the upper lobe in the adult being red, the inferior jet-black, its two 

 lowermost developed rays and their membranes abruptly pale (?in both 

 sexes). 



165. Iff. pcccaScirum Jordan. 



Body elongate, moderately compressed, somewhat elevated forwards. 

 Depth 4J in length. Head about the same. Mouth medium, the lips 

 full. Dorsal rays 13. Scales large, 5-44-4. Coloration usual, except 

 of the caudal fin ; other fins all red, with blackish shadiugs. Size 

 small. Louisiana and Southern Mississippi. 



(Jordan, Bull. U. S. Nat. Mus. x, 66; Jordan, Man. Vert. 315; Jordan, Bull. U. S. 

 Nat. Musi xii, 129.) 



ee. Scales very small for the genus, about 56 in lateral line; body moderately elongate, 

 the depth about 4 in length. 



166. M. aBbidum (Grd.) Jordan. 



Head shortish, conic, the snout not much projecting, about 4 in length ; 

 eye large. Dorsal fin small, with about 11 rays, the last rapidly 



