KEY TO GENERA— CENTRARCHID^. 77 



Sub-Order: Rhegnopteri. 



Group: Percoidea. 



Family: Centrarchid^E. 



Key to Genera. 



A. Dorsal fin scarcely longer than anal.— Poivioxrs. 



AA. Dorsal fin much larger than anal. 



B. Body comparatively short and deep, the depth usually more than % the length. 

 C. Tongue and pterygoids with teeth ; mouth large, maxillary reaching past 

 middle of eye. 



D. Opercle emarginate behind ; anal spines 6.— Ambloplites. 

 DD. Opercle ending in a black, convex process or flap ; anal spines, 3. — 



Ch^enobryttus. 

 CC. Tongue and pterygoids toothless ; mouth small, maxillary barely reach- 

 ing past middle of eye. 



E. Supplemental bone of maxillary perfectly distinct. — Apomotis. 

 EE. Supplemental bone of maxillary rudimentary or wanting. 



F. Lower pharyngeal bones narrow, the teeth usually sharp, not 



conical.— Lepomis. 



FF. Lower pharyngeals broad and concave, especially in the adult, 

 teeth more or less blunt and paved. — Eupomotis. 



BB. Body comparatively elongate, depth in adult about y 3 the length ; mouth 

 large. — Micropterus. 



Genus: Pomoxis. 

 Key to Species. 



A. Dorsal spines 6, occasionally 5, rarely 7 ; profile strongly sinuate, anal fin plain. — 



annularis. 

 AA. Dorsal spines 7, rarely 8 ; profile not strongly sinuate ; anal fin reticulate with dark 

 markings.— sparoides. 



Pomoxis annularis Rafinesque. Crappie ; Lake Erie Bass ; 

 Calico Bass. 



Head 3; depth 2^3 ; eye large, 4. D. V or VI, or sometimes VII, 15; A. 

 VI, 18; scales 6-48-14. Body elongate, much compressed. Head long; the 

 profile from snout to dorsal strongly sinuate; mouth ver} r wide. Fins very 

 high, but lower than in P. sparoides. Color, silvery olive, mottled with 

 dark green, the dark marks chief!}' on upper part of body and having a 

 tendency to form vertical bars; dorsal and caudal marked with dark green, 

 anal nearly plain. A lighter colored fish than P. sparoides. Quite variable. 

 Length 12 inches. 



Well distributed over the state in larger streams and lakes, 

 common. Recorded for the state by Dr. Kirtland, who gave it 

 the name Cichla storeria. "It occurs in large numbers in the 

 Ohio river and its tributaries, rarely taken in L,ake Erie, ' ' Jor- 

 dan's Report; Muskingum river, Ohio river at Raccoon Island, 

 Henshall, 1889; L,orain County, common, McCormick, 1892; 



