46 TELEOSTEI : EVENTOGNATHI. — XII. 



42. CTCLEPTUS Rafinesque. (kvkKos, round ; \errT6s, slender ; 

 according to Eafinesque, small round mouth.) 



74. C. elongatus (Le Sueur). Bi^ack Horse. Gourd-seed 

 Sucker. Missouri Sucker. Head small, short and slender, 

 rounded above ; opercles small ; eye small ; fins large. Color 

 blackish ; $ in spring covered with small tubercles. Head 7 ; 

 depth 4^ ; D. 30 ; scales 9-56-7. L. 2| feet. Miss, valley, rather 

 common in larger streams. 



43. CATOSTOMUS Lc Sueur. Fine-scaled Suckers. 

 (KOTta, inferior ; o-xo/xa, mouth.) 



u. Scales very small, much reduced and crowded anteriorly, about 100 in the 

 lateral line. (Catosiomus.) 



75. C. catostomus (Forster). Northern Sucker. Upper lip 

 thin, with 2 to 4 rows of papillae ; snout long, overhanging the large 

 mouth. Males in spring profusely tuberculate and with a broad 

 rosy lateral band. Great Lakes to Alaska, very abundant N. 



aa. Scales larger, but small and crowded forwards, about 65 in the lateral 

 line. (Decactylus Rafinesque.) 



76. C. teres (Mitchill). Common Sucker. White Sucker. 

 Upper lip thin, with 2 or 3 rows of papillae ; snout shorter than in 

 the preceding, the mouth smaller. Color olivaceous, dusky above ; 

 sides rosy in spring. Head 4|- ; depth 4^. D. 12. Scales 10-64 

 to 70-9. L. 18. Canada to Montana and Fla. ; commonest of the 

 Suckers, and extremely variable. (Lat., terete.) 



aaa. Scales large, scarcely crowded anteriorly, 48 to 55 in the lateral line. 

 (Hypentdium Rafinesque.) 



77. C. nigricans Le Sueur. HoG Sucker. Stone Roller. 

 Stone Lugger. Stone Toter. Hammer-head. Crawl-a- 

 BoTTOM. Hog Molly. Hog Mullet. Head flattened above, 

 concave between eyes; the frontal bone thick, broad and short; 

 eyes small, placed high ; upper lip thick, with 8 to 10 rows of 

 papillae ; lower fins large. Color brassy olive, the back with dark 

 cross-blotches, disappearing with age ; lower fins red. Head 4 ; 

 depth 4|. D. 11. Lat. 1. 48 to 55. L. 2 feet. Lakes and clear 

 streams, W. N. Y. to Ala. and Kans. (Lat, blackish.) 



44. ERIMTZON Jordan, (cpt, an intensive particle ; 

 fxi^a, to suck.) 



78. E. sucetta (Lacdpfede). Chub Sucker. Sweet Sucker. 

 Creek-fish. Scales crowded, deeper than long ; mandible oblique. 

 Color dusky, brassy below ; young with black bands or bars and 

 pale streaks. Head 4 ; depth 2|- in adult ; spring males with 6 

 tubercles on snout. T>. 11 to 13. Scales 43-15 in the northern 

 form, var. oMongus Mitchill (the true sucetta, southern, with scales 



