xii NORTHERN FISHES 



38. Eastern sauger, Stizostedion canadense canadense . . 208 



39. Walleye, Stizostedion vitreum vitreum 210 



40. A. River darter, Imostoma shumardi. B. Iowa darter, 

 Poecilichthys exilis. C. Northern logperch, Percina ca- 

 prodes semifasciata. D. Striped fantail, Catonotus flabel- 

 laris lineolatus. E. Scaly Johnny darter, Boleosoma 

 nigrum eulepis. F. Northern least darter, Microperca 

 microperca Tnicroperca 216 



41. A. Largemouth bass, Huro salmoides. B. Northern small- 

 mouth bass, Micropterus dolomieu dolomieu . facing 230 



42. Warmouth, Chaenobryttus coronarius 235 



43. Green siinfish, Lepomis cyanellus 236 



44. Orangespot sunfish, Lepotnis humilis 237 



45. Conamon bluegill, Lepomis machrochirus machrochirus 239 



46. A. Pumpkinseed, Lepomis gibbosus. B. Common bluegill, 

 Lepomis Tnacrochirus macrochirus facing 240 



47. Northern rock bass, Ambloplites rupestris rupestris . 241 



48. White crappie, Pomoxis annularis 242 



49. Black crappie, Pomoxis nigro-maculatus 243 



50. Northern brook silverside, Labidesthes siccuhis sicculus 245 



51. Freshwater sheepshead, Aplodinotus grunniens . . . 248 



52. Northern muddler, Cottus bairdii bairdii 252 



53. Slimy muddler, Cottus cognatus 253 



54. Slimy muddler, Cottus cognatus, dorsal view showing 

 large pectoral fins 253 



55. Brook stickleback, Eucalia inconstans 256 



56. Ninespine stickleback, Pungitius pungitius ..... 257 



57. Eastern burbot. Lota lota maculosa 259 



