64 PRELIMINARY REPORT 



Genus STIZOSTEDION Eafinesque. 

 KEY TO THE SPECIES OE STIZOSTEDION. 



A. Rays of the soft dorsal fia about 20, its base ^ shorter than the 

 spinous dorsal; pyloric cajca 3, each about equal to the length 

 of the stomach; a black blotch on the last dorsal spines; no 

 black blotch on the base of the pectoral fins. . . vitreum. 



A A. Eays of the soft dorsal fin about 17, its base ] less than the spinous 

 dorsal; pyloric caeca 4 to 7, shorter than the stomach and 

 unequal in length; no black blotch on the last dorsal spines; 

 ,a black blotch at the base of the pectoral fins. . . canadense. 



Stoizostedion vitreum (Mitchill). Wall-eyed Pike. Pike Perch. Dory. 

 Glass-eye. Yellow Pike. Blue Pike. Jack Salmon. White-eye. 



Color dark olive, mottled with brassy; a network of lines on the 

 sides of the head; lower parts and lower fins sometimes pinkish; a 

 large black spot on the last dorsal spines; soft dorsal mottled with 

 dark colors; no black spot at the base of the pectoral fins. Body 

 rather long and slender, heavy; 3 rather long pyloric caeca, as long 

 as the stomach. Head contained 3f times in the length. Depth 

 about 4|, Eye 4| to 5 in the head, not as wide as the length of the 

 snout. Dorsal fin XII to XVI, 19 to 21, its longest spine more than 

 half the length of the head. Anal II, 12 to 14, its length greater 

 than its height. Scales 10-110 to 132-25, very few on the cheeks 

 and upper surface of the head. Length 18 inches to 3 feet. 



A very common and valuable food fish. Its definite range has 

 not been determined, but it seems to be very widely distributed. 

 Specimens have been recorded from all the lakes and streams of the 

 Upper Mississippi, where collections have been made (Xat. Hist. 

 Surv., 1893-5); common in the lakes in the vicinity of Mankato, 

 Okabena lakes at Worthington and Round Lake near the same 

 place (Cox, 1894); common in Big Stone Lake (Woolman & Cox, 

 1892) ; Otter Tail River at Breckenridge, Red River of the North at 

 Grand Forks (N. D.) ; Red Lake River at Grand Forks and Crooks- 

 ton (Woolman, 1892, Report U. S. Fish Comm., 1893). 



Very little attention has been given by collectors in the state to 

 these two species of fishes, but it seems that S. vitreum is the one 

 commonly taken. 



Stizostedion canadense griseiini (De Kay). Sauger. Sand Pike. 



Color grayish with brassy reflections, the young more distinctly 

 marked than the adult; 2 or 3 rows of circular black spots on the 

 first dorsal fin, no black spot on the last spines; 3 irregular rows 

 of dark spots on the soft dorsal; a large black spot at the base of 



