338 
Crayfish, 215, 216. 
Crustacea, 35, 102, 161, 178. 
Creeping water bugs (see Naurcoride). 
Curicta howardi, 152. 
Cyclops, 35, 158. 
D. 
Daphnians, 34, 35, 138, 158, 179. 
Dawson, 35. 
De Geer, 13, 14, 91, 117, 158, 208, 234. 
Diatoms, 35, 245, 247. 
Desmids, 35. 
Dogs, 16, 158. 
Duckmeat, 245. 
Duck-weed, 101. 
Dufour, 15, 117, 208, 219, 238. 
KE. 
Ecology, 17, 28, 238, 180. 
Economic importance, 17, 35. 
Ege, 43. 
Electric light bug, 141. = 
Elodea, 177, 221, 244. 
Embody, 245. 
Enoch, 160. 
Entomostraca, 35, 37, 42, 177, 186, 
191, 197. 
Epistyllis, 146. 
Eschscholtz, 15. 
Essenberg, 117. 
Euglene, 35, 242, 244, 245, 247. 
Fabricius, 14. 
Fallen, 15. 
Feeding habits of aquatics, 33, 34. 
Fish, 177, 193, 228, 236. 
Fish eggs, 158. 
Fontinalis, 159. 
Forbes, 216. 
Form and Function, 38. 
Fragilaria, 246. 
Frisch, 18, 151, 158, 208. 
G. 
Gage, 36. 
Galgulide (see Gelastocoridx). 
Gelastocoridee, 8, 11, 20, 29, 39, 40, 42, 45. 
Gelastocoridx, Biology, 49. 
Gelastocoride, Key to genera, 46. 
Gelastocoris, 46. 
Gelastocoris, Key to genus, 46. 
Gelastocoris oculatus, 34, 47. 
Gelastocoris variegatus, 47. 
Gelastocoris vicinus, 47. 
Geoffrey, 13, 14, 157, 211. 
Gerride, 8, 11, 12, 24, 25, 29, 40, 106. . 
Gerridx, Biology of, 116, 121. 
Gerride, Key to genera, 107. 
Gerris, 29, 32, 42, 107. 
Gerris argenticollis, 108, 111. 
INDEX. 
Gerris buenoi, 108, 111. 
Gerris canaliculatus, 108, 112. 
Gerris conformis, 108, 109. 
Gerris gillettei, 108, 109. 
Gerris, Key to species, 108. : 
Gerris marginatus, 25, 26, 34, 108, 110. 
Gerris orba, 108. . 
Gerris remigis, 32, 34, 108, 116. 
Gerris robusta, 108. 
Gesner, 13. 
Giant water bugs (see Belostomatids).— 
Gonatonzygon, 244. 
Gregarine, 32. 
Gyrinidex, 181. 
18h 
Hagemann, 16, 237. 
Halobates, 30, 107, 116. 
Halobates micans, 116, 120. 
Halobates sericews, 116, 120. 
Harvey, 142. 
Hebridx, 8, 11, 12, 29, 33, 39, 82. 
Hebridx, Biology of, 88-91. 
Hebridx, Key to genera, 82. 
Hebrus, 29, 82, 89. 
Hebrus burmeistori, 85. 
Hebrus concinnus, 86, 8%. 
Hebrus consolidus, 86. 
Hebrus sobrinus, 86, 87. 
Hebrus, Key to species, 86. 
Heidemann, 92. 
Heterotrichs, 244, 247. 
Hewitt, 157. 
Hibernation of Notonectids, 32. 
Holmes, 160, 161. 
Hoppe, 43, 180. 
Howard, L. O., 148. 
Hydrobatidw (see Gerride). 
Hydrodictyon, 101. 
Hydrometra, 26, 39, 41, 91, 101. 
Hydrometra australis, 91, 92. 
Hydrometra, Key to species, 91. 
Hydrometra martini, 34, 91, 92. 
Hydrometra, parasite of, 32. : 
Hydrometride, 8, 11, 12, 25, 26, 29, 91. 
Hydrometridx, Biology of, 92, 99. 
Hydrachnids, 31, 182, 231. 
Hydrophilidx, 159. 
Toscytes, 56, 76. 
Toscytus politus, 76. : 
Toscytus politus var. flavicoslo, 77. — 
J. 
Jassids, 117. 
Johannsen, 181. 
Juncus, 34. 
