66. Head and mouth parts of a grasshopper 106 



67. Internal organs of a grasshopper 108 



68. Alimentary canal of a grasshopper 109 



69. Heart of an insect 112 



70. Respiratory system of a caterpillar 115 



71. The brain of a grasshopper 118 



72. Nervous system of a grasshopper 120 



73. Reproductive organs of an insect 122 



74. Ovipositor of a katydid 123 



75. Termites 126 



76. Termite work in a piece of wood 128 



77. Worker and soldier castes and young of a termite . . 130 



78. Heads of termite soldiers 132 



79. Winged caste of a termite 133 



80. Short-winged reproductive caste of a termite .... 135 



81. A wingless termite queen 138 



82. Termite king and queen 141 



83. Wing of an ordinary termite 145 



84. Wings of a Mastotermes 146 



85. Section of an underground termite nest 147 



86. Four types of termite nests 149 



87. Large termite nest 150 



88. Group of aphids feeding 153 



89. How an aphis feeds 154 



90. Section of the beak of an aphis 156 



91. Aphis eggs 157 



92. Aphis eggs just before hatching 158 



93. Young aphis emerging from the egg 159 



94. Young aphids on apple buds 161 



95. Young of three species of apple aphids 162 



96. Apple leaves infested by green apple aphis 163 



97. The green apple aphis 165 



98. The rosy apple aphis on apple 168 



99. The rosy apple aphis on plantain 169 



100. Male and female of the rosy apple aphis 170 



101. Some common aphids of the garden 171 



102. A ladybird beetle 173 



103. The aphis-lion 174 



104. The golden-eye, Chrysopa 176 



105. Larva of a syrphus fly feeding on aphids 176 



106. Adult syrphus flies . 177 



107. A parasitized aphis 178 



108. An aphis parasite, Aphidius 178 



109. A female Aphidius inserting an egg in a living aphis . 178 



no. Parasitized aphids on parasite cocoons 179 



ill. A parasitized lady-beetle larva 181 



112. A common cicada 183 



