350 
M yriopoda—Continued: 
—Spirobolus marginatus, 201, 236, 237, 
243, 253- 
Mysis relicta, 80, 81, 85. 
Natural selection, 25. 
Nature: 5, 6; man and, 8-20; man- 
made, 8; state of, 7; struggle in, 7. 
Neuroplera, scientific names: 
—Chauliodes, 123. 
rastricornis, 145, 148, 150, 155. 
—Chrysopa: 
albicornis, 297. 
oculata, 214, 291. 
rufialbris, 2601. 
—Corydalis cornuta, 116, 121. 
—Cryptoleon nebulosum, 283. 
—Mantispa 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; 
274. 
Orthoptera, 243, 272, 285, 292, 300. 
Ortho ptera, scientific names: 
—Acrididae, 187, 204. 
—A geneotetlix arenosus, 227, 252. 
—Amblycorypha, 205: 
oblongifolia, 208, 266, 267, 276. 
rotundifolia, 272. 
uhleri, 241. 
—A pithes agitator, 268. 
—A pterygida aculeata, 194, 205. 
—Atlanticus pachymerus, 239, 260. 
—Ceuthophilus, 205, 237, 239, 243. 
—Chiloealtis conspersa, 232, 250. 
—Conocephalus: 
ensiger, 232, 259, 298. 
nebrascensis, 264, 270. 
robustus, 265. 
—Cyrtophillus perspicillatus, 241, 260. 
—Diapheromera femorata, 187, 235, 241, 
257. 
—Dissosteira carolina, 198, 214, 218, 254. 
—Gryllus pennsylvanicus, 218. 
—Hippiscus tuberculatus, 255. 
—Ischnoptera: 
imaequalis, 218. 
major, 218. 
orchard, 
ANIMAL COMMUNITIES 
—Melanoplus: 
angustipennis, 227, 252. 
atlantis, 225, 228, 252. 
bivittatus, 198, 218, 276, 285, 297. 
differentialis, 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, t9o. 
—Oecanthus: 
angustipennis, 241, 260, 272. 
fasciatus, 232, 257, 272, 270. 
nivens, 272. 
—Orchelimum: 
glaberrimum, 204, 208. 
indianense, 270. 
vulgare, 292, 296, 2098. 
—Or phulella 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, 250, 260, 277, 203; 
297, 298. ve 
—Sparagemon wyomingianum, 228, 252. 
—Stenobothrus, 170: 
curtipennis, 188, 204, 266, 285, 296, 
208. 
—Tettigidea: 
armata, 181. 
parvipennis, 181, 282. 
pennata, 236, 282. 
—Tettix obscura, 190. 
—Trimerotropis maritima, 223, 252. 
—NXiphidium, 170: 
brevipenne, 188, 208, 263, 266. 
ensiferum, 215. 
fasciatum, 39, 188, 263, 264, 284, 
285, 290. 
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. 
—WNotodromas monacha, 144. 
—Ostracoda, 144. 
—Polamocypris smaragdina, 134. 
Otter, 195, 199. 
Oven-bird, 244. 
