586 
Deromyia, 89. 
discolor, 95. 
umbrina, 95. 
winthemi, 94-95. 
Desmodium illinoense, 555, 563. 
sessilifolium, 555, 563. 
Dexia abdominalis, 84. 
Dexiids, 78. 
Diabrotica 12-punctata, 201. 
Diatoms, 440, 441, 442, 443. 
Diceraeus euschistoides, 193. - 
Didelphys virginiana, 128. 
Diemyctylus viridescens, 239. 
Digger-wasps, 57. 
banded, 73-78. 
black, 53, 59-73. 
yellow-banded, 53. 
Digitaria sanguinalis, 559. 
Diodia teres, 549, 556, 567. 
Diolcus, 168. 
Diospyros virginiana, 335. 
Diplogaster aerivora, 119. 
Diplotaxis, 107. 
Diptera, 57, 88, 345-361. 
Discocephala, 175. 
Discocephalini, 174, 175. 
Discocerini, 196. 
Dodecatheon meadia, 556, 565. 
Dogfish, 155. 
fresh-water, 230. 
Dogs, 131-132. 
Dolichonyx oryzivorus, 126. 
Dorosoma, 231. 
cepedianum, 226, 230, 245, 246. 
Draba caroliniana, 563. 
Drum, 151, 155. 
Dryptocephala, 175. 
Duckweed, 317. 
Dumatella carolinensis, 126. - 
Dyscinetus, 59. 
Dysdercus, 160, 161. 
E 
Earthworms, 128. 
Echinochloa crusgalli, 298, 559. 
Echinorhynchidae, 235-239. 
INDEX 
Echinorhynchus, 232, 233, 235-236, 241. 
agilis, 247. 
angustatus, 233. 
clavaeceps, 233, 251, 252. 
clavula, 234. 
coregoni, 234, 235, 237, 254. 
gadi, 233, 234. 
gigas, 130. 
hexacanthus, 249. 
proteus, 233, 237. 
salmonis, 234. 
salvelini, 234, 235, 236-237, 254. 
thecatus, 228, 230, 282, 234, 236, 241, 
254. 
truttae, 234. 
Edessa, 175, 
cruciata, 196. 
lateralis, 195. 
Edessinae, 159. 
Edessini, 174, 175. 
Eel, American, 230. 
Eels, 150, 152. 
Elasmostethus cruciatus, 195, 196. 
Elaterid, 102. 
Elder bush, 335. 
Eleocharis acicularis, 554, 560. 
intermedia, 554, 555, 560. 
obtusa, 554, 555, 560. 
palustris, 554, 555, 560. 
wolfii, 560. 
Elis, 53, 55, 56, 57, 85, 89. 
atriventris, 76, 77. 
illinoisensis, 77, 78. 
interrupta, 76, 77-78. 
obscura, 78. 
5-cincta, 73-76, 77, 125. 
sexcincta, 76. 
spp., 73-78. 
Elm, 173, 174, 330, 332. 
Winged, 332. 
Elymus canadensis, 555, 560. 
glaucus, 560. 
virginicus, 555, 560. 
Emys serrata, 242. 
Entomostraca, 457. 
Eorhynchus, 241, 245, 246. 
