_Aphelinus fuscipennis_, 40 _Aphelinus mali_, 47 _Aphelinus mytilaspidis_, 38, 40 Aphides, 42 Aphis-lion, 28, 78 _Aphis persicæ-niger_, 44 Apple, 34, 35, 37, 38, 40, 41, 47, 48, 61, 64, 67 Apple leaf-hopper, 48 Apple leaf-roller, 51 Apple mealy-bug, 34 Apple mussel-scale, 30, 37 Apple red-mite, 57 Apricot, 35, 36, 38 Army-worms, 54 Arsenate of lead, 76 Asexual, 42 Ash, 38 Asparagus, 36 _Aspidiotus hederæ_, 40 _Aspidiotus perniciosus_, 38 _Asterolecanium variolosum_, 37 Austrian pine, 46 Bacteria, 14, 15 Bag-moth, 56 Baker’s mealy-bug, 35 Beet eelworm, 72 Beetles, 56 Begonia, 34 Beneficial insects, 77, 78 Birds, 79 Blackberry, 36, 41 Blackbird, 35 Black cherry-aphis, 44 Black-currant, 36, 44 Black-leaf 40, 76 Black peach-aphis, 44 Black scale, 40 Blister-mites, 70 Blue-gum, 59 Borers, round-headed, 64 Breathing systems of insects, 21 _Brevicoryne brassicæ_, 45 Briar, 41 Bronze beetle, 58 Broods of insects, 22 Broom, 52 Brown-beetle, 58 Brown-mite, 68 Brussels sprouts, 45 _Bryobia prætiosa_, 68 Bulb-eelworm, 72 Bulb-mite, 68 Bulb or Narcissus flies, 66 Cabbage, 45, 48, 55 Cabbage aphis, 45 Cabbage green-fly, 45 Cabbage-tree, 56 Cabbage-tree moth, 56 Cabbage-tree scales, 38 Cabbage white butterfly, 55 Calcium cyanide, 76 _Caliora limacina_, 59 Camellia, 35, 36, 37, 40 Camellia scale, 37 Carbon-bisulphide, 76 Caterpillars, 51 Caterpillars in lawns, 65 Cauliflower, 45, 55 _Cecidomyia oleariæ_, 60 Cereals, 54 Chalcid wasps, 78 Chemicals, 75 _Chermes pini_, 46 Cherry, 38, 44, 59 Cherry-aphis, black, 44 Cherry slug, 59 Chitin, 17 Chrysalis, 25 Chrysanthemum, 64 _Chrysomphalus aurantii_, 40 _Chrysomphalus rossi_, 40 Cicada, 28 Cineraria, 24, 34, 56, 64 Citrophilus mealy-bug, 34 Citrus, 32, 35, 36, 40, 64, 67 Click-beetles, 65 Clover, 52 Coccids, 29 _Coccus hesperidum_, 36 Cockchafers, 57 Cockroach, 17, 27 Cocoon, 25 Codlin moth, 61 Comstock’s mealy-bug, 35 Contact sprays and dusts, 76 Convolvulus, 54 Coprosma, 40 Cornicles, 42 Cottony-cushion scale, 30, 32 Crayfish, 17 Crickets, 27, 51 Crocus, 68 Crop rotation, 75 Cruciferous crops, 45 Cryptolæmus ladybird, 34 _Cryptolæmus montrouzieri_, 34 Curl-grubs, 58 Currant, 37, 38, 61, 68 Currant clear-wing borer, 61 Cuticle, 17 Cut-worms, 52 _Cydia pomonella_, 61 Daffodil, 72 Development of insects, 22 Diamond-backed moth, 52 Digestive system of insects, 21 Douglas fir, 32, 46 Dusts, 75 Earthworms, 15 Earwig, 27, 50 Easter lily, 68 Eelworms, 8, 72 Eggs of insects, 22 Elder, 35 Eleagnus, 37 Elm, 38, 47 Elm-leaf aphis, 42, 47 Elytra, 58 Ensign wasps, 78 _Eriococcus coriaceus_, 35 _Eriophyes pyri_, 70