xii LIST OF ILLUSTRATIONS 



no. PAGE 



95. Lithobius forficatus, dissected to show the internal organs 230 



96. lulus terrestris, sometimes called the "Wire-worm" . . 231 



97. Two views of a male Cockroach, Stylopyga orientalis . 234 



98. Mouth appendages of Stylopyga 235 



99. Female Cockroach dissected to show the viscera . . 239 



100. A Grasshopper, Pachytylus migratorius .... 247 



101. A male Cockchafer, Melolontha vulgaris . . . 248 



102. Larva of Bombyx mori, the Silkworm . . . . 249 



103. Cocoon of Bombyx mori * . 250 



104. Silkworm moth, Bombyx mori . . .... . 250 



105. The Lady-bird, Coccinella septempunctata, its larva, and the 



adult beetle 254 



106. View of internal organs of the male Cockchafer, Melolontha 



vulgaris 255 



107 View of the nervous system of the Cockchafer, Melolontha 



vulgaris .......... 255 



108. Male, female and neuter of the Wood-ant, Formica rufa . 256 



109. Drone, queen and worker of the Honey-bee, Apis mellifica . 256 



110. A Wasp, Polistes tepidus, and its nest .... 256 



111. . The Tsetse-fly, Glossina morsitans . . . . . 257 



112. The Hessian-fly, Cecidomyia destructor .... 257 



113. The Garden Spider, Epeira diademata, sitting in the centre 



of its web 260 



114. Front view of the head of a Spider, Textrix denticulata . 261 



115. Pedipalp of the large House-spider, Tegenaria guyonii . 262 



116. Horizontal section through the abdomen of a Spider, 



Argyroneta . . . *> ... . . . . . 263 



117. Longitudinal section through the lung-book of a Spider . 263 



118. Lateral view of the internal organs of a Spider, Epeira 



diademata . * . . . : .... . . . 264 



119. Diagrammatic view of a palpal organ .... 265 



120. A Phalangid or Harvestman, Oligolophus spinosus . . 267 



121. Male and female of the Cheese-mite, Tyroglyphus siro, seen 



from the ventral side . ..... .... . . . . 268 



122. Dorsal and ventral views of the Indian Scorpion, Scorpio 



swammerdami . . . ...... ". . . 270 



123. Sections through the central and lateral eyes of a Scorpion, 



Euscorpius italicus . . . . . . . 271 



124. Dorsal view of the King-crab, Limulus polyphemus . . 273 



125. Ventral view of the King-crab, Limulus polyphemus. . 274 



126. Longitudinal section through the operculum and gills of a 



King-crab, Limulus . . . . . . . . 275 



127. Side view of a Snail, Helix pomatia, the animal being 



expanded 285 



128. Dorsal view of a Snail, Helix pomatia, after removal of the shell 287 



