LIST OF ILLUSTRATIONS xxv 



PAGE 



FIG. 430. Johnny Darter, Boleosoma nigrum 282 



FIG. 431. Rainbow Darter, Etheostoma 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 nigricans . ... . 284 



FIG. 436. Straw-colored Minnow, Nolropis blennius . ' . . . 285 



FIG. 437. Rock Bass, Ambloplites rupestris . *-.<..-.. - . 285 



FIG. 438. Black Crappie, Pomoxis sparoides . , ; . . ...... 285 



FIG. 439. Sucker-mouthed Minnow, Phenacobius mirabilis .' . 286 



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



FIG. 441. Black-sided Darter, Hadropterus aspro ! . - ; V '. . 286 



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



FIG. 443. Net Building Caddis Fly, Hydropsyche . v . . 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 . 290 



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 . . . ._ . . . 3 11 



