340 
Ochterus bankst, 52. 
Ochterus flaviclavus, 52. 
Ochterus, Key to species, 51. 
Oligochetes, 35, 242. 
Oliver, 14, 
Ormerod, 161. 
Orthoptera, 39. 
Oscellatoria, 244, 245, 247. 
Ostrocods, 24, 26, 34, 35, 42, 96, 97, 102, 
138, 161, 177, 186, 191, 193, 248. 
Oviposition of aquatics, 33. 
12 
Palmocorixa, 186. 
Palmocorixa, 211; 212. 
Palmocorixa, Key to species, 213. 
Palmocorixa buenoi, 27, 213, 221. 
Palmocorixa yillettii, 213, 214. 
Palumba, 92. 
Paramecium, 247. 
Parasites, 182. 
Parasitism, 31, 32, 231. 
Parshley, 51. 
Pediastrum, 248. 
Pelocoris, 198, 205, 208. 
Pelocoris biimpressus, 206, 207. 
Pelocoris carolinensis, 205, 206. 
Pelocoris femoratus, 206, 207, 209. 
Pelocoris, Key to species, 205. 
Pelogonus, 51. 
Pentacora, 55, 56. 
Pentacora hirta, 57. 
Pentacora ligata, 58. 
Pentacora signoreti, 56. 
Pettit, 160. 
Phyllopods, 186. 
Plant lice, 101, 102. 
Plea, 2305 35, 41, 165, 277. 
Plea minutissima, 179. 
Plea striola, 33, 166, 177. — 
Polygonum amphibium, 235. 
Potamogeton, 101. 
Prestwichia aquatica, 32, 160. 
Proctrotrypidx, 32, 
Protozoa, 242. 
Protozoa, 35. 
R. 
Ramphocorixa acuminata, 33, 211, 212, 215. 
Ranatra, 13, 30, 31, 32, 153, 158. 
Ranatra brecivolis, 155. 
Ranatra americana, 154. 
Ranatra annulipes, 159. 
Ranatra kirkaldyi, 154. 
Ranatra nigra, 154. 
Ranatra protensa, 156. 
Ranatra quadridentata, 158. 
Ranunculus aquatiles, 179. 
Rathke, 235. 
Reaumur, 138, 14, 15. 
INDEX. 
Redfern, 195. 
Regembart, 180, 208. 
Respiration of aquatics, 43. 
Reuter, 9, 11, 54, 211. 
Rhagovelia, 30, 122, 128, 139. 
Rhagovelia armata, 128, 130. 
Rhagovelia distincta, 128, 129. 
Rhagovelia obesa, 40, 128. 
Rhagovelia plumbea, 128, 130.- 
Rheumatobates, 30, 33, 34, 42, 107, 
115, 120. 
Rheumatobates, Key to species, 116. 
Riley OsR yO (dale 
Riley, C. V., 148. 
Riley, W. A., 181. 
Rivularia, 246. 
Reesel, (18) 114,157) 158, 208; 
Rotifers, 35, 242, 244. 
Ss. 
Salda, 55, 59. : 
Salda anthracina, 61, 80, 81. 
Salda coriacea, 60. 
Salda littoralis, 59. 
Saldide, 8, 11, 12, 18, 26, 29, 33, 39, 
42, 54. 
Saldidw, Biology of, 79. ° 
Saldine, Key to genera, 55. 
Saldoida, 75. 
Saldoida cornuta, 79. 
Saldoida slossoni, 78. 
Saldula, 55-62. 
Saldula confluenta, 63. 
Saldula dispersa, 65. 
Saldula elongata, 72. 
Saldula explanata, 64. 
Saldula interstitialis, 65. 
Saldula laticollis, 69.— 
Saldula luctuosa, 73. 
Saldula lugubris, 72. 
Saldula major, 62. 
Saldula opacula, 70. 
Saldula orbiculata, 63. 
Saldula pellita, 71. 
Saldula reperta, 67. 
Saldula saltatoria, 73. 
Saldula scotica, 71. 
Saldula separata, 66. 
Saldula sphacelata, 69. 
Saldula pallipes, 68. 
Saldula zanthochila, 68. 
Savigny, 15. 
Say, 36. 
Scenedesmus, 35-244. 
Schmidt, 144. 
Schummel, 15. 
Scirpus, 157. 
Scott, 101. 
Sedge, 108. 
Severin & Severin, 145, 158. 
