INDEX. 



A. 



Abdomen, 47, 49, 97, 102, 107, 126, 

 132, 136, 140, 142, 151, 153, 156, 161, 

 166, 168, 173, 196, 231, 232, 236, 238, 

 243, 257, 258, 262-264, 266, 267, 272, 

 274, 275. [See Descriptions of 

 types.] 



Acceleration in development, 143, 144, 

 283, 285, 286. 



law of, 112, 163, 229, 246, 278, 



282, 286. 



Achoreutes nivicola, 66. 



Acridian Orthoptera, 40. 



Acrididae, 9, 109. 



Acridium, 25. 



Actias Luna, 208. 



Adaptation of animals, 28, 108, 165. 



Adaptive characters, 58, 77, 91, 102, 

 105, iTi, 112, 121, 129, 163, 269, 271, 

 279, 280. [See Correlative struc- 

 tures.] 



yEschna, 82. 



Affinities of Lepidoptera, 221. 



African Termites, 97. 



Agrion, gills of, 84. 



Agrionidae, 74, 81. 



Agrotis, 207. 



Air-sac.-., 38, 39, 67. 



Alulets, 253, 265. 



American copper butterfly, 218. 



Eclipse Expedition, 71. 



silkworm, 196, 207. 



Ametabola, 276. 



Ammonia, 73. 



Anabolia, 178. 



Anal area of wing, 30. 



Anasa tristis, 115. 



Ancestral characteristics, 54. 



Ancient cockroaches, 105. 



Anisopteryx pometaria, 203. 



Antennae, 9, 97, 103, 106, 107, 109, 

 122, 132, 135, 139, 158, 163, 164, 196, 

 200, 203, 212, 233. [See Descrip- 

 tions of types.] 



Antennae, functions of, 22, 23. 

 Anthophora, 159. 

 Anthrenus scrophulariae, 153. 

 Antispila, 183, 202. 

 Ant-lions, 170, 173-175. 

 Ants, 92, 93, 136, 238-240, 265. 

 Aphaniptera, 268. 

 Aphides, 97, 135-137, 240, 265. 

 Aphididae, 135. 

 Aphis, 135. 

 Aphis-lions, 173, 175. 

 Apical margin of wing, 30. 

 Apidae, 244. 

 Apis mellifica, 223, 244. 

 Aquatic Heteroptera, 121. 

 Arachnida, 272. 

 Arachnids, 47, 165. 

 Archaic butterflies, 222. 

 Arizona, 241. 

 Army-worm, 205. 

 Arthropoda, 12, 24. 

 Articulata, 11, 12, 165. 

 Artificial wing, 31. 



directions for making, 31, 32. 



Asilidae, 262, 263. 

 Aspidiotus conchiformis, 138. 

 Aspidisca, 202. 

 Attacus Promethea, 208. 



Back-swimming water-boatman, 121. 

 Balancers, 250, 253, 257. [See Hal- 



teres.] 

 Balaninus, 24. 



caryatrypes, 165. 



Balfour, iii. 

 Bamboo, 31. 



Basilarchia Disippus, 219. 

 Basis of classification, 240. 

 Bat-ticks, 271. 

 Beak, 121, 123, 125. 

 Bed-bugs, 127, 129. 

 Bee-lice, 271. 

 Beetles, blister, 157. 



289 



