LIST OF ILLUSTRATIONS xxv 



PAGE 



FIG. 430. Johnny Darter, Boleosoma nigrum 282 



FIG. 431. Rainbow Darter, Etlieostoma coeruleum .... 283 



FIG. 432. Common Sucker, Catostomus commersonii .... 283 



FIG. 433. Stone Roller, Campostoma anomalum 283 



FIG. 434. Top Minnow, Fundulus dispar 284 



FIG. 435. Hog Sucker, Catostomus nigr leans 284 



FIG. 436. Straw-colored Minnow, Notropis blennius .... 285 



FIG. 437. Rock Bass, Ambloplites rupesiris 285 



FIG. 438. Black Crappie, Pomoxis sparoides 285 



FIG. 439. Sucker-mouthed Minnow, PhenacoUus mirabilis . . 286 



FIG. 440. Fan -tailed Darter, Etheostoma flabellare .... 286 



FIG. 441. Black-sided Darter, Hadropterus aspro .... 286 



FIG. 442. Sharp-headed Darter, Hadropterus phoxocephalus . . 287 

 FIG. 443. Net Building Caddis Fly, Hydropsyche . . . .288 



FIG. 444. Caddis-Fly Larva, Helicopsyche 288 



FIG. 445. Water Penny, Larva of Psephenus lecontei . . . . 288 



FIG. 446. Brook Beetle, Psephenus lecontei 288 



FIG. 447. A Common Rotifer 288 



FIG. 448. The Lower Galien River Plant Zonation in Foreground . 20)0 



CHAPTER XIV 



FIG. 449. Map of Potato-Beetle Invasion 299 



FIG. 450. Map of Cotton-Boll Weevil 301 



FIG. 451. Map of Tree Distribution 302 



FIG. 452. Map of Chicago Localities 311 



