INDEX 



ABDOMEN, the seat of certain systems, 18 

 Acacia attacked by beetle-grubs, 99 

 Acraeidae, as models for mimicry, 255, 260 

 Adaptation, high, of lepidoptera to floral 



diet, 62 

 of external colouring to conditions of 



life, 204 

 Adaptive colouring, principle of, solved 



by theory of natural selection, 205 

 to what formerly attributed ; in- 

 adequacy of such solutions, 205 

 Adjustment of colour is adaptive, 241 



is produced and maintained by natural 



selection, 241 



Adult insects subject to parasites, 40 

 ./Egeriidae, mimicry of, 265 

 Aggressive mimicry, 272 

 Aggressive resemblance, 223, 224, 226 

 Agricultural Ant, of American plains, 57, 



I 35, 140 



of Florida, 57, 135, 140 

 of Texas, where found, 135 ; disks and 

 paths, underground store-rooms, 

 135 ; marvellous work of clearance 

 of disks and avenues, use of, 56, 

 136 ; refuse heaps, 137 ; stored 

 grain, use, 137 ; question of cultiva- 

 tion of grain by, 138 ; mound disks, 

 internal structure, 138, 139 

 Alimentary canal in insects, 21 

 Alluring colouring of mantises, 223, 226 

 Analogy between economy of honey-ant 

 and that of bee in storage of food, 51 

 Andrenidae, homes of, 74 



as models for mimicry, 273 

 Animal-feeding insects, 37 

 Animal matters a food of insects, 41 

 Ant-cows, 42, 45, 150 



their protection by ants, 43, 150 

 domestication of, 43 

 food of, 44, 150 

 breeders of, 44 

 Ant-honey, uses for, 54 

 Ant-lion, stratagem of, 66 

 Antennae as appendages of head, 19 



Ants, 



European, providence of, 55, 57 



attending aphides, 42 



remarkable instance of foresight of, 44 



nursing duties of, 48, 124 



slave-making, 49 



storage of food by, 51, 55, 57, 146 



nests, three types of, 120 



workers in earth, 120 



eggs, so called, 125 



as guardians of plants, 149 



and beetles, 45 



and Cocci, 45, 150 



carpenter, 146 



wood, 120 



mason, 119, 128 



as models for mimicry, 267, 269, 272,273 



saiiba, 133 

 Apis, indica. and nigrocincta, 162 



dorsata, 162 

 JJoralis, 163 



in West Indies and South America, 



163 

 Apoica, architecture of, 184 



canopy of nest, use of, 185 



occasional hexagonal shape of nest, 186 

 Apparent suddenness of metamorphic 



changes, 31 



Appendages of head, 19 

 Aquatic larvae, 12, 13, 105 



caddis flies, 12, 105 



of hydrocampidae, 107 

 Architecture, ins3ct, propriety of use of 



word, 119 



Argyronetra aquatica, home, construc- 

 tion of, 115 



in England, 115 



breather of atmospheric air, 115 



deposition of eggs of, 116 



life of young, 116 



Association, of bright colour with distaste- 

 ful qualities, 246 ; part played by 

 natural selection in, 247, 248 



of wings with function of respiration, 



18 



Attachment of wings, 17 

 Azara, on Chiguana, 198 



u 



