CATOSTOMIDA. — XXV. AT 
36-15). Mass. to Dakota and S.,verycommon. (Var. sucetta, Va. 
to Fla. and Texas.) (Fr. sucet, sucker.) 
45. MINYTREMA Jordan. (us, lessened; rphua, aperture ; 
from the imperfect lateral line.) 
79. M. melanops Rafinesque. Srripep Sucker. Body 
subterete, little compressed; mouth small, inferior; eye small; 
scales little crowded forwards. Color dusky, coppery below, a 
dusky blotch behind dorsal; each scale with a dark spot at its 
base, most distinct in adult, these forming longitudinal stripes; 
& tuberculate in spring; lateral line wanting in young, imperfect 
at 8 inches, nearly complete in adults. Head 44; depth 3 to 44. 
D.12to14. Scales 46-13. L.15. Great Lakes to 8S. C. and Texas. 
(péAas, black ; aw, look.) 
46. MOXOSTOMA Rafinesque. Rep Horse. (uo, to suck ; 
o7déua, mouth.) 
a. Lips distinctly plicate. 
&. Dorsal large, with 15 to 18 developed rays, its free edge not concave. 
80. M. anisurum (Rafinesque). Wuite Nosr Sucker. Body 
robust, compressed ; mouth large, inferior, the upper lip thin, the 
lower strongly A-shaped ; D. high and large, the first ray about as 
long as fin; upper lobe of C. narrow, longer than lower. Color 
pale; C. smoky gray; lower fins red. Head 4; depth 34. D.15 
to 18. L.18. N.C.to Ohio R., Great Lakes, and N. (Catost. 
carpio C, & V., not of Raf.; Moz. valenciennesi Jordan; Ptychosto- 
mus velatus and collapsus Cope. (daoos, unequal; ovpa, tail.) 
6b. Dorsal fin moderate, of 12 to 14 rays; lower lip full, scarcely A-shaped, 
nearly truncate behind. 
c. Dorsal fin with its free margin nearly straight. 
d. Head large, 4 to 4? in length. 
81. M. macrolepidotum (Le Sueur). Common Rep Horse. 
WHITE Sucker. “MuLLET.” Head broad, flattish above; mouth 
large, with thick lips; depth of cheek usually more than half dis- 
tance from snout to preopercle; eye large; edge of D. nearly 
straight, its first ray shorter than head; C. lobes subequal. Oliva- 
ceous, with bright reflections ; sides silvery; lower fins always 
orange-red, C. sometimes so. Head 4 to nearly 5; depth 34. 
D. usually 13; A. 7. Scales as in other species 5-45-4. L. 2 feet. 
Chesapeake Bay to Dakota and Ala., very abundant; the western 
form (var. duquesnei Le Sueur) with head and mouth rather 
larger than in the eastern form, which approaches JJ. aureolum. 
(uaxpés, large ; AemSwrds, scaled.) 
dd. Head short and small, 4} to 54 in length. 
82. M. aureolum (Le Sueur). Lake Rep Horse. Head 
shorter and smaller; mouth rather small, with thick lips; snout 
