3 62 



ANIMAL COMMUNITIES 



Myriopoda — Continued: 



— Spirobolus marginatus, 201, 236, 237, 



243, 2 53- 

 My sis r dicta, 80, 81, 85. 



Natural selection, 25. 

 Nature: 5, 6; man and, 8-20; man- 

 made, 8; state of, 7; struggle in, 7. 

 Neuroptcra, scientific names: 

 — Chauliodes, 123. 



rastricornis, 145, 148, 150, 155. 

 — Chrysopa: 



albicornis, 297. 



oculata, 214, 291. 



rujialbris, 261. 

 — Corydalis cornuta, 116, 121. 

 — Cryptoleon nebulosurn, 283. 

 — Mantis pa brunnea, 273, 274. 

 — Sialis, 121. 

 Newt, 121, 149, 156. 

 Nitrates, 66. 



Nitrogen: 59, 60; cause of gas-bubble 

 disease, 60; in lakes, 125; in spring 

 water, 93. 



Number of individuals, relation to area 

 of optimum, 303. 



Onion- fly, 293. 



Optimum, range of, 300-305. 



Oriole: Baltimore, 274, 275; orchard, 



274. 

 Orthoptera, 243, 272, 285, 292, 306. 

 Orthoptera, scientific names: 

 — Acrididae, 187, 204. 

 — Ageneotettix arenosus, 227, 252. 

 — Amblycorypha, 205: 



oblongifolia, 208, 266, 267, 276. 



rotundifolia, 272. 



uhleri, 241. 

 — Apilhes agitator, 268. 

 — Apterygida aculeata, 194, 205. 

 — Atlanticus pachymerus, 239, 260. 

 — Ceuthophilus, 205, 237, 239, 243. 

 — Chloealtis conspersa, 232, 259. 

 — Conocephalus: 



ensiger, 232, 259, 298. 



nebrascensis , 264, 276. 



robustus, 265. 

 — Cyrtophillus perspicillatus, 241, 260. 

 — Diapheromera femorata, 187, 235, 241, 



257. 

 — Dissosteira Carolina, 198, 214, 218, 254. 

 — Gryllus pennsylvanicus, 218. 

 — Hippiscus tuber culatus , 255. 

 — Ischnoptera: 



inaequalis, 218. 



major, 218. 



— Melanoplus: 



angustipennis, 227, 252. 



atlanis, 225, 228, 252. 



bivittatus, 198, 218, 276, 285, 297. 



dijferentialis, 266, 276. 



femur-rubrum, 187, 214, 218, 223, 



276, 285, 296. 



punctulatus, 194, 195, 205. 



viridipes, 297. 

 — Nemobius: 



fasciatus vittatus, 298. 



maculatus, 263, 297. 

 — Neotettix hancocki, 190. 

 — Oecanthus: 



angustipennis, 241, 260, 272. 



fasciatus, 232, 257, 272, 276. 



nivens, 272. 

 — Orchelimum: 



glaberrimum, 204, 208. 



indianense, 276. 



vulgare, 292, 296, 298. 

 — Orphulella speciosa, 297. 

 — Paratettix cucullatus, 181, 186. 

 — Paroxya hoosieri, 204. 

 — Psinidia fenestralis, 223, 225, 252. 

 — Schistocerca rubiginosa, 232, 257. 

 — Scudderia, 214, 217: 



furcata, 241, 266, 267, 276. 



texensis, 232, 259, 266, 277, 293, 



297, 298. 

 — Sparagemon wyomingianum, 228, 252. 

 ■ — -Sienobothrus, 170: 



curtipennis, 188, 204, 266, 285, 296, 



298. 

 —Tettigidea: 



armata, 181. 



parvipennis, 181, 282. 



pennata, 236, 282. 

 — Tettix obscura, 190. 

 — Trimerotropis maritima, 223, 252. 

 — Xiphidium, 1 70 : 



brevipenne, 188, 208, 263, 266 



ensiferum, 215. 



fasciatum, 39, 188, 263, 264, 284, 



285, 296. 



nigropleura, 263, 276. 



strictum, 232, 259, 292, 293, 298. 

 Osprey, 226. 

 Ostracods, 129. 



Ostracods or Ostracoda, scientific names: 

 — Cypria exsculpta, 152. 

 — Cypridopsis vidua, 130, 152. 

 — Cypris fuscata, 185. 

 — Cyprois marginata, 177, 179, 185. 

 — Notodromas monacha, 144. 

 ■ — Ostracoda, 144. 

 —Potamocypris smaragdina, 134. 

 Otter, 195, 199. 

 Oven-bird, 244. 



