338 



Index. 



Crayfish, 215, 216. 

 Crustacea, 35, 102, 161, 178. 

 Creeping water bugs (see Naurcoridae). 

 Curicta howardi, 152. 

 Cyclops, 35, 158. 



D. 



Daphnians, 34, 35, 138, 158, 179. 



Dawson, 35. 



DeGeer, 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. 



E. 

 Ecology, 17, 28, 38, 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. 

 Euglenae, 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, 13, 151, 158, 208. 



G. 

 Gage, 36. 



Galgulidae (see Gelastocoridac). 

 Gelastocorid», 8, 11, 20, 29, 39, 40, 42, 45. 

 Gelastocorida", Biology, 49. 

 Gelastocoridae, Key to genera, 46. 

 Gelastocoris, 46. 

 Gelastocoris, Key to genus, 46. 

 Gelastocoris orulatus, 34, 47. 

 Gelastocoris variegatiis, 47. 

 Gelastocoris vicinus, 47. 

 Geoffrey, 13, 14, 157, 211. 

 Gerridae, 8, 11, 12, 24, 25, 29, 40, 106. 

 Gerridre, Biology of, 116, 121. 

 Gerridas, Key to genera, 107. 

 Gerris, 29, 32, 42, 107. 

 Gerris argenticoUis, 108, 111. 



Gerris buenoi, 108, 111. 



Gerris canaliculatns, 108, 112. 



Gerris eonformis, 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 Belostomatidae). 



Gonatonzygon, 244. 



Gregarine, 32. 



Gyrinidoe, 181. 



H. 



Hagemann, 16, 237. 



Halobates, 30, 107, 116. 



Halobates micans, 116, 120. 



Halobates sericens, 116, 120. 



Harvey, 142. 



Hebridoe, 8, 11, 12, 29, 33, 39, 82. 



HebridsB, Biology of, 88-91. 



Hebridse, Key to genera, 82. 



Hebrus, 29, 82, 85. 



IJebrus burmcistori, 85. 



Hebrus concinnus, 86, 87. 



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. 



HydrobatidiB (see Gerridae). 



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. 



Hydrometridae, 8, 11, 12, 25, ,26, 29, 91. 



Hydrometridae, Biology of, 92, 99. 



Hydrachnids, 31, 182, 231. 



Hydrophilidte, 159. 



loscytes, 56, 76. 



loscytus politus, 76. 



loscytus politus var. flavicoslo, 77. 



J. 



Jassids, 117. 

 Johannsen, 181. 

 Juncus, 34. 



