960 FISHES — PEECIDJE. 



Genus 70. STIZOSTEDIUM. Eafineeque. 



Stizostedion, Eapinksque, Ich. Oh. 1820, 23. 



Pomacampsis, Eafinbsque, Ich Oh., 1820 {Perca nigropunotata, Eaf. ; an erroneously de- 

 scribed or mythical species.). 



Ludoperca, Cuv. and Val., Hist. Nat. des Poissons, ii, 1838, 110 {Perea lucioperca L.- 

 Lueioperca sandra, C. & V). 



Sandrui, Staek, Elements of Nat. Hist., i, 1828, 465. 



Stizosiediwm, Cofe, Pioc. Acad. Nat. Sci. Phila., 1865, 83, 85 (amended oithogiaphy), 



Stizostethium, Jordan, Ann. N. Y. Lyo. Nat. Hist., 1877 (amended oithography), 



Centropomus, Bleeeer, 1877 (Centropomus tandat, Lac. ; P. lucioperca L. is the first species 

 mentioned by Lacepede in his genus Centropomus — not Centropomus of Cuvier and 

 Gill — Centropomus undeeimalU Lac, a West ladia species, having been by them se- 

 lected as the type of Centropomus.). 



Cynoperca, Gill and Jordan, Bull. U. S. Nat. Mas., x, 1877, 45 (subgenus, based on 

 Lucioperca canadensis, Hamilton Smith.). 



Mimoperca, Gill and Jordan, Bull. U. S. Nat. Mus., x, ,1877, 45 (subgenus, based on 

 Perca volgensis, Pallas.). 



Perca and Centropomus, sp. early authors. 



Type, Stizostedion salmoneum, Eafinesque. 



Perches, with the body elongate, little compressed, and the premaxUlaries and pala- 

 tines provided with some large teeth, arranged in rows, the rest of the teeth uniform ; 

 tongue toothless ; head conical, elongate, depressed, partly covered with small ctenoid 

 scales; preoperoulnm serrated; operculum armed with one to twenty spines of varying 

 size, the terminations of rib like elevations on the surface of the bone ; dorsal fins sep- 

 arated, the first with twelve to fifteen spines, the second with seventeen to twenty- 

 three soft rays. This genus consists of about five species, abounding in the fresh waters 

 of North America and Europe. They are, of course, carnivorous and voracious, but 

 are everywhere highly valued for food. 



Analysis op Species op Stizostedium. 



Dorsal fins well separates, the interspace between them more than the diameter 

 of the eye ; the distance from the base of the last spine of the first dorsal, and the first 

 of the second equal to the space occupied by the last four to six spines of the first dor- 

 sal ; anal fin II, 12, longer than high ; second dorsal I, 17 to I, 21 ; spines of the second 

 dorsal and anal closely attached to the soft rays ; last dorsal spine scarcely erectile, 

 more or less firmly bound down by the membrane; canine teeth strong (American 

 species ). 



• Soft dorsal comparatively short (its base one-fourth shorter than that of spinous 

 dorsal), and with about seventeen short rays; cheeks, opercles, and top of head more 

 or less closely scaled ; body depressed, subterete ; size small ; pyloric cceoa forming two 

 groups, the primary one of four, unequal, moderate, much shorter than the stomach ; 

 the secondary of few (1-3) rudimentary ones, which are sometimes atrophied. 



canadensis. 



* * Soft dorsal rather long (one-sixth shorter than spinous dorsal), with about twenty 

 Boft rays ; cheeks and upper surface of head nearly naked ; body more compressed ; size 

 large; pyloric coeca three, subequal, all along (about as long as stomach). 



