:jo. catostomid^e — moxostoma. 
141 
blackish at their bases ; lower fms white ; top of head, humeral bar, and 
dorsal fin dusky, o^euse Eiver, North Carolina. [Cope.) Probably 
identical with the preceding. 
(Pti/cJwstomus crassilahris Cope, Proc. Amer. Phil. Soc. Phila. 1870, 477 ; Jordan, Man. 
Vert. 314; Jordan, Ball. U. S. Nat. Mus. xii, 123.) 
163. M. cosaias (Cope) Jordan. 
Body flattish, the dorsal outline elevated, the form being’ like that of 
71/. corcgonus. Head small and conic. Mouth exceedingly small, the 
snout far overpassing it, the muzzle being much longer than in 71/. 
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.) 
(Ptycliostomus conus Copo, Proc. Amer. Phil. Soc. Phila. 1870, 478; Jordan, Man. 
Vert. 314; Jordan, Bull. U. S. Nat. Mus. xii, 126.) 
0 
ff. Caudal fin with the upper lobe longer than the lower, the tAvo similarly colored. 
164. M. asisstu'caBii (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 3.J 
in length. Head conic, flattish, 5^- in length. Mouth very small, much 
as in aurcolum, from which it can probably be distinguished only bj" the 
form of the caudal. D. 12-13, half higher than long. Scales G-4G-5. 
Ohio Valley and Great Lake region. 
{Catoslomus aiiisurus liaf. Ichtli. Oli, 54 : Ptijchostomus breviceps Cope, Proc. Amer. 
Phil. Soc. Phila. 1870, 478; Jordan, Man. Vert. 315; Jordan, Bull. U. S. Nat. Mus. xii, 
1-26.) 
fj'f. 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 tAvo 
lowermost de\’eloped rays and their membranes abruptly pale (fin both 
sexes). 
165. HI. ptiACSlsiruBSi Jordan. 
Body elongate, moderately compressed, somewhat elevated forwards. 
Depth 4^ in length. Head about the same. IMouth 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 shadings. Size 
small. Louisiana and Southern Mississippi. 
(.Jordan, Bull. U. S. Nat. Mus. x, 06; Jordan, Man. Vert. 315; Jordan, Bull. U. S. 
Nat. Mus. xii, 129.) 
ee. Scales Amry small for the genus, about 56 in lateral line ; body moderately elongate, 
the depth about 4 in length. 
166. HI. iiBbidtam (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 
