160. Contents of the pupal blood 303 



161. Moths of the tent caterpillar 307 



162. Head of a tent caterpillar moth 308 



163. Head of a peach borer moth 308 



164. Transformation of the alimentary canal 310 



165. Reproductive organs of a female moth 312 



166. Young tent caterpillars in the egg 313 



167. A robber fly . 316 



168. Wings of insects 317 



169. The black horsefly 320 



170. Mouth parts of a horsefly 322 



171. Structure of a fly maggot 325 



172. Rat-tailed maggots 326 



173. Larva and pupa of a horsefly 328 



174. Life stages of a mosquito 330 



175. Structure of a mosquito larva 332 



176. Mouth parts of a mosquito 334 



177. A male mosquito 335 



178. Mosquito larvae 337 



179. Mosquito pupae 339 



180. The female malaria mosquito 340 



181. Feeding positions of mosquito laivae 341 



1 82. Life stages of the house fly 344 



183. Head and mouth parts of the house fly 346 



184. Head of the stable fly 347 



185. A tsetse fly 349 



186. Head and mouth parts of the tsetse fly 351 



