Insects, affecting park trees, 74 affecting the orange, 75 affecting woodland trees, 74 and animal forms of Caledonia Creek, N. Y., 147, 148 aquatic, 74 aquatic in Adirondacks, 75 bibliography, 74, 75 bionomics of, 128 cactus, 135 carrion-feeding, 146 collecting, 58 environmental influences upon, 96, 97 eyes, 110 flowers and, 142, 143 food, 128 habitats, 128, 135 hibernation, 128 Illinois, 74 in grave, 144 influence in economy of nature, 135 influenced by animal substances, 135 influenced by climate, 135 influenced by environment, 135 influenced by man, 135 influenced by plants, 135 influenced by soil, 135 initiating successions, 127 instinct, 128 life histories, 70, 73 life histories in Lintner’s New York State entomologist’s reports, 74 mimicry of South African, 128 Missouri, 77 motions, 128 Neuropteroid, synopsis, catalogue, and bibliography, 71 New Mexico, 148 New York, 74 noises, 128 parasitic and other kinds of castration in, 130 parasitism, 129, 130 preserving, 58 protective adaptations against birds by, 125 seasonal succession, 141 senses, 111 social community, 135 social life, 111 societies, 128 stratagems, 128 study, 59 systematic literature, 71 warning colors of South African, 128 Instinct, and intelligence, 120 birds, 113 blindness of, 103 death-feigning, 113 insects, 128 Leptinotarsa, 119 raccoons, 110 spiders, 117 Instruments, 57, 59 Integrative action of nervous system, 98 Intelligence, and imitation in birds, 117 and instinct, 120 animal, of the raccoon, 111 birds, 113 evolution of animal, 114 nature and development of animal, 115 raccoons, 110, 111 Interactions of organisms, 49, 123 Internal relations, 1 Interpretation, dynamical, 82 Interrelations, 5 between forests and insects, 127 of the social community, 131 parasitic, of the bee community, 139 Introducing noxious animals, 124 Invertebrate animals of Vineyard Sound, 136 Invertebrate fauna of Isle Royale, ecological relations, 146 Invertebrates, census, 62 life histories, 70, 136 marine, 136, 146 Investigation, methods of scientific, 56 _Iris versicolor_ L., fruiting, 142 Isle Royale, as biotic environment, 91 birds, ecological succession, 124, 133 birds’ habitats, 148 ecology of Coleoptera, 145 ecological relations of invertebrate fauna, 146 mammals of, ecological succession, 145 _Isophyllia_, feeding reactions, 109 Isopods, of ponds and streams, responses, 106 physiological states and rheotaxis, 106 reactions of surface and subterranean, 108 reactions to light, 108 Jutland, sandy flats of, animals, 136, 137 Kiel Bay, fauna, 138 food of animals in, 129 Krakatau, new flora, 89