530 CONTRIBUTIOXS TO NORTH AMERICAN ICHTHYOLOGY IV. 



second anal spine ^ length of head. Axis of body rather below the 

 middle of its depth. Head conical, slightly depressed at the nape. 

 Mouth small, nearly horizontal; maxillary reaching middle of pupil. 

 Head about 3^- in length; depth about 2i. Eye large, its diameter 

 equal to the length of the snout. D. IX-I, 14 ; A. Ill, 12 ; Lat. 1. 55. 

 L. 15 inches. Great Lakes, Mississippi Valley, and northward. A game 

 fish of some repute. 



(Perca chry&ops Raf. Ich. Oh. 1820, 28: Lahrax multiUneatus Kirtland, Bost. Jour. 

 Nat. Hist. V, 21 : Boccus chrysops Gill, Proc. Acad. Nat. Sci. Phila. 1860, 11.3 : Lahrax 

 osculaUi, muUilineata, and notaia Giinther, i, 65, 67: Lahrax albidus Dekay, New York 

 Fauua, Fish. 1842, 13.) 



11). No teeth on base of tongue; second anal spine enlarged; jaws equal; scales on 

 cheeks ctenoid ; dorsal fins somewhat connected, (i/orojic* Gill.) 

 d. Sides striped with black. 



§32. R. iEB«erB'MptMS (Gill) J. & G.—YeUow Bass. 



Brassy, tinged with olivaceous above ; sides with T very distinct lon- 

 gitudinal black bands, darker than in the other species, those below 

 the lateral line interrupted posteriorly, the posterior part alternating 

 with the anterior. Body oblong-ovate, with the dorsal outline much 

 arched. Head depressed, somewhat pointed, its profile concave. Eyes 

 large, their diameter equalling length of snout. Mouth somewhat 

 oblique, maxillary nearly reaching middle of orbit. Spines very robust; 

 second anal spine f length of head. Dorsal fins little connected. Head 

 3 in length; depth 2§. D. IX-I, 12; A. HI, 9 ; Lat. 1. 50. L. 1 fool. 

 Mississippi Valley, chiefly southward; north to Illinois. 



{Lahrax chrysops Girard, U. S. Pac. R. R. Surv. Fish. 1858, 29 ; not Perca chrysops 

 Raf. : Morone interrupta Gill, Proc. Acad. Nat. Sci. Phila. 1860, 118.) 



dd. Sides not striped with black. 



833. R. aBUCricanus (Gmel.) J. & G. — TThite Perch. 



Olivaceous ; sides silvery, with faint lighter streaks. Body oblong- 

 ovate ; dorsal outline much arched ; the head depressed above eyes, 

 and rather pointed. Mouth rather small, somewhat oblique, maxillary 

 nearly reaching the vertical from the middle of the orbit. Eye mod- 

 erate, its diameter about equal to length of snout. Spines strong, the 

 second anal spine nearly J length of head. Dorsal fins considerably 

 connected. Head 3 in length ; depth about 3. D. IX-I, 12; A. Ill, 9; 



* GUI, Proc. Acad. Nat. Sci. Phila. 18C0, 116 : type Perca aviericana Gmel. Morone 

 Mitch. Rcpt. Fish. N. Y. 1814, 18; is properly a synonym o{ Perca. (Meaning, if any, 

 unknown.) 



