96 VERTEBRATE ANIMALS OF THE UNITED STATES 



b2 Adipose fin separated from the tail by a notch. 



Ci Posterior serrae of pectoral spine not half the diameter of 

 the spine. 



di From Wisconsin to Kansas .S'. exilis. 



do From Pennsylvania to South CaroHna S. insignis. 



da In the Roanoke River 5". gilberti. 



Co Posterior serrae of pectoral spine almost as long as the 

 diameter of the spine. 



di Color plain 5. eleutherus. 



do Color blotched S. miurus. 



S. furiosus. 



S. gyrinus (Mitchill). Mad-tom (Fig. 42). Length 125 mm.; head 

 ■,l.$ to 4; depth 4 to 5.5; color uniform yellowish brown, with a narrow 



Fig. 42. — Schilbeodes gyrinus {from Fishes of Illinois). 



lateral black streak; pectoral spine smooth; adipose fin continuous with 

 the tail fin; anal fin with 13 to 15 rays: Hudson River and westward 

 throughout the Great Lakes region and Mississippi Valley; common 

 towards the north. 



5. exilis (Nelson). Length 100 mm.; head 4; depth 5 to 6.5; color 

 yellowish, mottled; anal fin with 14 to 17 rays: Wisconsin to Kansas; 

 common. 



S. insignis (Nel.). Mad-tom. Length 250 mm.; head 4.25; depth 

 6; color dark brown, somewhat mottled; fins dark edged; anal fin with 

 14 to 16 rays; upper jaw projecting: New York to South Carolina; very 

 common in coastal streams. 



5. miurus (Jordan). Length 100 mm.; head 4; depth 5; color 

 mottled black and gray, with 4 black blotches; top of head, tip of dorsal, 

 middle of adipose and edge of caudal fins black; adipose fin with a deep 

 notch, but connected with the tail fin; anal fin with 13 to 15 rays: 

 Mississippi Valley and tributaries of Lakes Ontario and Michigan; 

 common. 



S. furiosus Jordan & Meek. Like S. miurus, but with long spines: 

 eastern North Carolina. 



