CATOSTOMID^. — XXV. 47 



36-15). Mass. to Dakota and S., very common. (Var. sucetia,Ya,. 

 to Fla. and Texas.) (Fr. sucet, sucker.) 



45. MINYTREMA Jordan, (fums, lessened ; rpijim, aperture ; 



from the imperfect lateral line.) 



79. M. melanops Rafinesque. Striped 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 ; 

 J tuberculate in spring ; lateral line wanting in young, imperfect 

 at 8 inches, nearly complete in adults. Head 4^ ; depth 3 to 4^. 

 D. 12 to 14. Scales 46-13. L. 15. Great Lakes to S. C. and Texas. 

 (fifKas, black ; &\jf, look.) 



46. MOXOSTOMA Rafinesque. Red Horse, (nufa, to suck ; 



arojia, mouth.) 

 a. Lips distinctly plicate. 

 b. Dorsal large, with 16 to 18 developed ra^'s, its free edge not concave. 



80. M. anisurum (Rafinesque). White Nose 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 S^. D. 15 

 to 18. L. 18. N. C. to Ohio R., Great Lakes, and N. (Catost. 

 carpio C. & V., not of Raf. ; Max. valenciennesi Jordan; Ptychosto- 

 mus velatus and collapsus Cope, {avia-os, unequal ; ovpa, tail.) 



bb. 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 Red 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 3J. 

 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. duqueanei Le Sueur) with head and mouth rather 

 larger than in the eastern form, which approaches M. aureolum. 

 (fiaKp6s, large ; XeiriSoiTos, scaled.) 



dd. Head short and small, 4i to 5J in length. 



82. M. aureolum (Le Sueur). Lake Red Horse. Head 

 shorter and smaller; mouth rather small, with thick lips; snout 



