222 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



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

 Scales larger than in N. cn/yy.>/v///,s-. not much crowded forward. Lateral 

 line much declined. Dorsal iiu entirely behind vent nils, its last ray 

 over (he lirst ray of the anal. Fins all small. Coloration of 8. corpo- 

 ralix; the black dorsal spot distinct. Head .';} ; depth 4. D. 85 A. 7j 

 dee :_is_f> ; teeth L', fi-l, L'. L. 1 inches. Flint lliver, Georgia. 



(Jordan. IJull. U. S. Nat. Mus. >:, (,::. is?7.) 



"' lusiTtiiiii (if dorsal lin scarcely behind ventrals: scales nearly equal over the body; 

 no conspicuous black dorsal spot. (Leucosomus Heckcl.) 







349. S. bUllariS (Raf.) JoT.FaU-Jish ; Siln-r Chub. 



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 iu 

 young specimens. 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; males in spring 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. 



(Cyprinus &uHaris Ratinesque, Amur. Mouth. Maj;. and Crit. Rev. 1817, 120: Lcucisciu 

 argenteus and pulchellas Storcr, Kept. Fish. Mass. 1839, 90 : Chiloncmua pulcliellu* Storer, 

 Fish. Mass. 28G : Leucosomu* cat ! laird : Semotilus rJtotheus Cope, Cypr. Perm. 362 : 



Lfucosomvu jinlchclliia Giinther, \\i. -J 



06. SYUIUIETRURUS Jordan. 



(Jordan, Bull. Haydcn's (Jeol. Surv. Terr, iv, 783, 1878: type Pogonichthys argijreiosut 

 Girard.) 



This genus dill'ers from Pogonichthys chiefly in the caudal lin. which 

 is developed as in Scmolil.ua and other related genera, the two lobes 

 equal, and (he rudimentary ha- s comparatively lev,- and small. 



The. pre.M-iicc of grinding sui ' :i tho teeth and the position of the 



barbel chieily <li-f iv juish Symmctrurus from Semotilus. (ffomiE-poq, sym- 

 metrical : tail.) 



:J3O. S. ar^yrioSUS ((Jirard') .lor. 



Body elongated, pivtty strongly c.iMipressed. Head moderate, con- 

 Mderahly ;oin])n'<sed. HP- BDOat : .-.nieal. Mouth nioderatc, nearly 

 hori/ontal. the lower jaw include'!, the maxillary reaching the front of 



