LIST OF ILLUSTRATIONS 



XXV 



Fig. 430. 

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443. 

 444. 



445- 

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448. 



Fig. 449.- 

 FiG. 450.- 

 FiG. 451.- 

 FiG. 452.- 



- Johnny Darter, Boleosoma nigrum 

 -Rainbow Darter, Etheo stoma coeruleum 

 -Common Sucker, Catostomus commersonii . 

 -Stone Roller, Campostoma anomaliim . 

 -Top INIinnow, Fundulus dispar 

 -Hog Sucker, Catostomus nigricans 

 -Straw-colored Minnow, Notropis hlennius . 

 -Rock Bass, AmblopUtes rupestris . 

 -Black Crappie, Pomoxis sparoides 

 -Sucker-mouthed Minnow, Phenacohius mirabilis 

 -Fan -tailed Darter, Ethcostoma flahellarc 

 -Black-sided Darter, Hadropterns aspro 

 -Sharp-headed Darter, Hadropterns phoxocephalus 

 -Net Building Caddis Fly, Hydropsyche 

 -Caddis-Fly Larva, Helicopsyche 

 -Water Penny, Larva of Psephemis lecontei . 

 -Brook Beetle, Psephenus lecontei ... 



-A Common Rotifer 



-The Lower Galien River — Plant Zonation in Foreground 



Chapter XIV 



-Map of Potato-Beetle Invasion 



-Map of Cotton-Boll Weevil 



-Map of Tree Distribution 



-Map of Chicago Localities 



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