140 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
dd. Dorsal rays 12-14 in iinmBer. 
e. Scales large, 41-50 in the coarse of the lateral line. 
/. Caudal tin normal, the two lobes about equal and similarly colored. 
169. naJlCJ’OSCilJitlolcam (Le Sueur) Jordan. — Common Rod Uorsc; Mullet; 
White Sucker ; Large-scaled Sucker. 
Head comparatively elongate, bluiitisb, rather broad and tlattened 
above, 4-5 in length. Body stontish, varying to moderately elongate. 
Lips rather fall, thebhmtish muzzle projecting beyond the large month ; 
greatest depth of cheeks more titan half distance from snout to pre- 
opercle. Eye rather large. Dorsal fin medium, its developed rays 12- 
14, usually 13 in number, its free edge nearly straight, its longest ray 
shorter than head. Scales large, about 45 in the lateral line. Oliva- 
ceous; sides silvery ; lower tins in the adult red or orange. Great Lakes 
to Virginia, southwestward to Arizona ; one of the most abundant 
fishes, reaching a length of 2 feet or more. The Red Horse of the Ohio 
and Mississippi, with the liead relatively longer and the mouth larger, 
is iierhaps worthy of distinction as var. dfiqucsni (Le Sueur) Jor. The 
eastern form (var. macrolepidotum) is scarcely distinguishable from the 
next species. 
(Catostomus macroleindotus and duquesni Lc Sueur, Jouru. Acad. Nat. Sci. Rhila. i, 
94, 105, 1817: Catostomus erijthrurus Rtf. Amcr. Mouth. Mag. 1818. 354: Catostomus 
Gunther, vii, 18: Mgxostoma maerolepidota and vars. duquesni i\,w\ laclirgmalis 
Jordan, Man. Vert. 313; Jordan, Bull. U. S. Nat. Mus. xii, 120: Ptjjehostomus du- 
quesni, erythrurus, rohusfus, oneida, lachryrnale, etc. Cope, Rroc. Amcr. Rhil Soc. 1870. 
Myxostoma euryops Jordan, Ann. Lyc. Nat. Hist. N. Y. 1870, 348, is probably a mon- 
strosity of this species. ) 
161. M. acis'colusn (Le S.) Jordan. 
Head comparatively short, low and small, conic, 5 -5.4 in length. Back 
elevated and compressed. Depth 3^ in length. Mouth small, over- 
jiassed by the snout, the lips thin and small, the greatest depth of cheek 
half the distance from suout to preoiiercle. Eye small. Coloration 
bright yellowish brown, somewhat silvery ; lower fins bright red. Dor- 
sal rays 13, the fin somewhat falcate, its free edge concave, its longest 
ray longer than head. Scales 5-45-4. Great Lakes, Ohio Valley, and 
northward. 
(Catostomus aureohis Lo Sueur, Journ. Acad. Nat. Sci. Phila. i, 95, 1817 : Catostomus 
macrolepidotus Giinther, vii, 18; .Jordan, Man. Yert. 314; .Jordan, Bull. U. S. Nat. Mus. 
xii, 124: ? Cyprinus les u cur i liich, Franklin’s Jouru. 1823, 772.) 
163. WI. cs’assnSaibrc (Cope) Joi-dau. 
Body llattish, the back elevated and compressed. Depth 3|. Muzzle 
contracted, lower lii) thick. Scales large, 5-44-5. Dorsal rays usually 
12. Dorsal fin elevated in front, its first soft ray longer than the base 
of the fin. Color silvery, with smoky shading above, some of the seales 
