446 



INDEX 



New species, formation of, 13-17, 24. 

 Night hawk, or Bull-bat, 246, 247. 

 Nimble grasshopper (Orchelimum 



volantum), 428. 

 Nocturnal insects, 162, 301-303; 



Katydids, 388-392 ; Mole crickets, 



377, 378. 

 Northern locust (Melanoplus extre- 



mus), 420. 

 Northern mole cricket (Gryllotalpa 



horealis), 28, 302, 376-378, 390, 



425. 

 Notes of insects, see Stridulation. 

 Nut weevil (Balaninus nasicus), 



289. 

 Nuts, protection of unripe, 29; 



squirrels' food, 237. 



Oak, antiquity of, 30; beetles, at- 

 tracted to, 107, 108; in dunes, 

 295. 



Oak, burr, habitat of weevil, 101, 

 102. 



Oblong-wing Katydid (Amblycory- 

 pha oUongfoUa), 389-391, 428. 



Obovate-winged locust (Melanoplus 

 obovatipennis), 422. 



Obscure grouse locust (Tetrix ob- 

 scura), 330, 419. 



Ocean, definition of, 430. 



Ocnera dispar moth, 63. 



Odors, plant, use in attracting in- 

 sects, 30, 32. 



Odynerus wasp, 214. 



Ontogeny, as a factor in evolution, 

 17, 158. 



OpMon, Ichneumon fly, 62, 114. 



" Orange-puppy," 152. 



Orange-tip butterfly ( Anfhocharis 

 genutia), adaptation of, 21, 83-86. 



Orange-vringed locust (Hippiscus 

 pJtoenicopterus), 422. 



Orchard, definition of, 431. 



Orchestration, see Stridulation. 



Organic evolution, books on, 24. 



Organs, protective, in caterpillars, 

 150, 151, 153, 154. 



Organs, scent, see Sense organs. 



Oriental cockroach (Blatta orienta- 

 lis), 416, 426. 



Origin of species, 24. 



Oriole, Baltimore, see Baltimore 

 oriole. 



Ornate grouse locust (Tetrix or- 

 nata), 411-414, 421. 



" Ornithophilus Pollination," quo- 

 tation from, 44. 



Orthogenesis, definition of, 16; 

 views of "Whitman and others on, 

 16, 17. 



Orthoptera, habitat, 824-830, 419- 

 429; interpretation of environ- 

 ment as exemplified in, 315-418 ; 

 night resorts of, 388-392; see also 

 Cockroaches, Crickets, Locusts, 

 Grasshoppers, Katydids. 



Osborn, influences which govern evo- 

 lution, quoted, 25. 



Osmeterium, or scent organ, of 

 Cresphorites, 150, 151, 168, 169. 



Ovipositors, various kinds of, 42(5. 



Packard, quotes Eiley on Schizura 



unicornis, 114; spider, change of 



color in, 186. 

 Painted lady butterfly (Fyrameis 



cardui), 139-142. 

 Pangenesis, Darwin 's hypothesis of, 



24. 

 Parasites of puss moth, 154; Mac- 



roteleira^ 195; reared from cells 



of potter wasp, 207, 208. 

 Parasitic Hymenoptera, Anephares 



rufipes, new species, 176, 177; 



Chrysis, 208; Eupelmus, 92, 163; 



Macroteleira, 195; OpMon maoru- 



rum, 62^ Ophion purgator, 114; 



Telenomiis, 62, 92. 

 Paratettix locust, habitat, 413, 414. 

 Paroxya locust (Paroxya scudderi), 



420. 

 Parthenogenesis, the aphid example 



of, 53. 

 Pasture, definition of, 432. 

 Pasture locust (Orphuella speoiosa), 



adaptation, 277, 292, 399-401; 



habitat, 421. 

 Peckhams, The, on Golden spex 



wasp, 198; on sense of sight in 



spiders, 194. 

 Pelidnota, 302. 

 Pelopaeus wasp, 212. 

 Pennsylvania cockroach (Ischnop- 



tera pennsylvanica), habitat, 416- 



418, 425. 

 Pennsylvania field cricket (GryXlui 



pennsylvanicus), 326, 328, 386, 



387, 423. 

 Pennyroyal, and bees, 276. 

 Pergande, on gall-producing aphida, 



50. 



