222 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



Barbel lateral, well developed. Eye small, 5 in head. Cheeks swollen. 



Scales larger than in S. corporalisj not much crowded forward. Lateral 



line much decurved. Dorsal hu entirely behind veutrals, its last ray 



over the first ray of the anal. Fins all small. Coloration of 8. corpo- 



ralis; the black dorsal spot distinct. Head 3|; depth 4. D. 8; A. 7j 



scales 9-48-5; teeth 2, 5-4, 2. L. 4 inches. Flint Eiver, Georgia. 



(Jord.in, Bull. U. S. Nat. Mns. x, 63, 1877.) 



** lusertiou of dorsal fia scarcely behiud ventrals ; scales nearly equal over the body ; 

 uo conspicuous black dorsal spot. {Leucosomus Heckel.) 



349. S. bullaris (Raf.) Jot.— Fall-fish; Silver Chnh. 



Body oblong, robust, little compressed. Head large, convex, the 

 snout bluntly conic. Mouth large, terminal, somewhat oblique, the 

 lower jaw included; premaxillary below the level of the eye, the max- 

 illary barely reaching the front of the orbit. Eye moderate, rather high 

 up and anterior, 4^ in head. Barbel shorter than pupil, not evident in 

 young si^ecimens. Scales large, 22 in front of dorsal, not crowded an- 

 teriorly. Dorsal fin slightly behind middle of body, just behind ven- 

 trals. Fins moderate. Coloration brilliant; steel-blue above; sides 

 and belly silvery f males in sjuing with the belly and lower fins rosy or 

 crimson. Head 4; depth 4. D. 8; A. 8; scales 8-45-4 ; teeth 2, 5-4, 2. 

 L. 18 inches. Largest of our Eastern Cyprinidce. Abundant from 

 Massachusetts to Virginia, east of the Alleghanies. 



(Ci/prinus hullarisltah'aesquo, Amar. Month. Mag. andCrit. Rev. 1817, 120: Leuciscus 

 argenteus and pulchellus Storer, Rept. Fish. Mass. 1839, 90 : Chiloncmus pnlchellus Storer, 

 Fish. Mass. 286 : Leucosomus cataractus Baird : SemoUlus rhotheiis Cope, Cypr. Penn. 362 : 

 Leucosomus pulchellus GUnther, vii, 268.) 



96.— SYMMETRUKUS Jordan. 



(Jordan, Bull. Hayden's Geol. Surv. Terr, iv, 788, 1878: type Pogonichthya argijreioaut 

 Girard.) 



This genus differs from Pogonichthys chiefly in the caudal fin, which 

 is developed as in SemoUlus and other related genera, the two lobes 

 equal, and the rudimentary basal rays comparatively few and small. 

 The presence of grinding surface on the teeth and the position of the 

 barbel chiefly distinguish Symmctrurus from SemoUlus. {ffu/i/iSTpoq, sym- 

 metrical ; ovpd^ tail.) 



350. S. arg-yriosns (Girard) Jor. 



Body elongated, pretty strongly compressed. Head moderate, con- 

 siderably compressed, the snout subconical. Mouth moderate, nearly 

 horizontal, the lower jaw included, the maxillary reaching the front of 



