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 



borealis), 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 ohlongfoUa), 3S9-391, 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. 



Odyncnts wasp, 214. 



Ontogeny, as a factor in evolution, 

 17, 158. 



Ophion, lohneumon fly. 62, 114. 



" Orange-puppy," 152. 



Orange-tip butterfly (Anthocharis 

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



Orange-winged locust (Hippiscus 

 phoinicopterus), 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, 324-330, 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. 



Osmeteriura, or scent organ, of 

 CresphoDtes, 150, 151, 168, 169. 



Ovipositors, various kinds of, 426. 



Packard, quotes Eiley on Schizura 



unicorius, 114; spider, change of 



color in, 186. 

 Painted lady butterfly (Pyrameis 



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, Anepharea 



rnfipes, new species, 176, 177; 



Chrysis, 208; Eupelmus, 92, 163; 



IMacroteleira, 195; Ophion macru- 



rum, 62; Oj)}tion purgator, 114; 



Telenomus, 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 speciosa), 



adaptation, 277, 292, 399-401; 



habitat, 421. 

 Peckhams, The, on Golden spex 



wasp, 198; on sense of sight in 



spiders, 194. 

 Pclidnota, 302. 

 Pelopaeus wasp, 212. 

 Pennsylvania cockroach (Ischnop- 



tera pennsi/lvanica), habitat, 416- 



418, 425. 

 Pennsylvania field cricket (Gryllus 



pennsi/h-anicus), 326, 328, 386, 



387, 423. 

 Pennyroyal, and bees, 276. 

 Pcrgande, on gall-producing aphids, 



50. 



