CYPKINID^. — XXVI. 65 



gg. Sides bright silvery, without dusky shade. 



143. H. storeriauus (Kirtland). Body rather elongate ; back 

 elevated ; tail long. Head short, broad between eyes ; eye equal 

 to snout, three in head ; preorbital broad, conspicuous, silvery ; 

 snout abruptly decurved, its tip Heshy ; lateral line decurved ; fins 

 high. Light olive, sides brightly silvery; fins all pale. Head 

 41 ; depth 4. D. 8. A. 8. Scales 5-42-4. L. 4 to 8. Ohio 

 to Neb. and Tenn., abundant in larger streams. {Ceratichthi/s 

 lucens Jordan.) (To David Humphreys Storer, author of Fishes 

 of Mass.) 



aa. Species of large size, little silvery, the mouth nearly terminal ; D. slightly 

 behind V. {Nocomis Girard.) 



144. H. keutuckiensis (Rafinesque). Horny Head. River 

 Chub. Jerker. Robust ; head large, broad above, the snout long, 

 bluntish; mouth large, little oblique, the lower jaw shorter; eye 

 small ; suborbitals narrow ; barbel evident ; scales not crowded 

 forwards, 18 before D. Bluish olive, with coppery shades ; a dark 

 bar behind opercle ; fins pale orange, unspotted ; young with a 

 black spot at base C. Adult males in spring with a much swollen 

 crest and large tubercles ; a round crimson spot on each side of 

 head. Head 4; depth 4^. D. 8. A 7. Scales 6-41-4. Teeth 

 4-4 or 1, 4-4, 1. L. 10. Penn. to Dakota and Ala., very abundant 

 in the rivers, rarely in small brooks; variable. (^Ceratichthys bigut- 

 tatus Kirtland.) 



61. COUESIUS Jordan. (To Dr. Elliott Coues.) 

 a. Scales small, about 68 in the lateral line. 



145. C. plumbeus (Agassiz). Body rather elongate ; head 

 small; snout bluntish; mouth rather small, terminal; eye 4 in 

 head; D. above V. Dusky, a plumbeous lateral band, fins plain. 

 Head 5; depth 5. D. 8. A. 7. Scales 11-68-7. L. 6. Teeth 

 usually 2, 4-4, 2. N. N. Y. {Mather) to L. Superior, chiefly in 

 or near cold lakes. (Lat., leaden.) 



aa. Scales larger, about 60 in the lateral line. 



146. C. dissimilis (Girard). Body more robust, with lateral 

 line more decurved. Mouth oblique, subterminal, resembling that 

 oi Semotilus. Dusky. Head 4^; depth 4|^. Lat. 1. 60. L. 6. IVIinn. 

 to Montana. 



62. PLATYGOBIO Gill. (TrXarils, broad ; Lat. gohio, gudgeon.) 



147. P. gracilis (Richardson). Flat-headed Chub. Body 

 elongate; head short, small, very broad and depressed above, the 

 interorbital area 2 in head ; mouth large, oblique ; eye small, 6 in 

 head; fins large; 23 scales before D. Very pale, sides silvery, 



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