xxii LIST OF ILLUSTRATIONS 



FIG. J'AtiE 



101. Eggs of the Small Tortoiseshell Butterfly . . 153 



102. Eggs of the Common Meadow -brown Butterfly . . 154 



103. Eggs of the Small Copper Butterfly . . . 155 



104. Parasite of tortoise 159 



105. Parasite of humble-bee ...... 160 



106. Parasite of humble-bee, fore-parts . . . .161 



107. Beetle and parasite . . . . . . .164 



108. Pincer of beetle parasite 165 



109. Parasites of house-fly ....... 166 



no. A sheep tick 169 



in. Foreparts of sheep tick 170 



112. Parasite of pig 172 



113. Parasite of ostrich 174 



114. Parasite of crow ... .... 175 



115. Parasite of pigeon 176 



1 16. Parasite of tawny owl . . . . . . .178 



117. Parasite of pike . . . . . . . .179 



1 1 8. Parasite of polecat 181 



119. Parasite of bat 182 



120. Lancets and blood-suckers of gad-fly . . . 185 



121. Tip of gad-fly's lancets 186 



122. Tip of gad-fly's blood-sucker . ... 187 



123. Another view of the gad-fly's mouth . . . .188 



124. Mouth-weapons of the female mosquito . . .190 



125. Head of male mosquito ...... 191 



126. Mouth of wasp ........ 192 



127. Mouth of spider 193 



128. Foot of fly 195 



129. Foreleg of a water-beetle 196 



130. Feathered oar of water-boatman 197 



131. Poison-bag and sting of wasp 198 



132. Egg-depositor of an ichneumon fly . . . 199 



133. Another insect bayonet 200 



134. Ichneumon fly's foot ....... 201 



135. Ichneumon fly which lays its eggs in "blight " . . 202 



136. Tip of saw of saw-fly 203 



137. The saw-fly's weapons 204 



