[13- Young nymph of the periodical cicada 



14 



186 



Older nymph of the periodical cicada l8 7 



15. Underground cells of the periodical cicada l88 



16. Fore leg of a cicada nymph 9 



17. Cicada turrets r 9 2 



18. Transformation of the cicada '9" 



19. Two forms of the periodical cicada 2 °° 



20. Male of the periodical cicada 2 °° 



21. The head and beak of a cicada 2 ° 2 



22. The sucking organ of a cicada 2o 4 



23. Section of a cicada's body 2 °" 



24. Sound-making organs of a cicada 2 °9 



25. Egg and newly-hatched nymph of the cicada .... 220 



26. Young cicada nymph 22 4 



27. Moths of the fall webworm 22 7 



28. The celery caterpillar and butterfly 22 9 



29. The Luna moth 2 3° 



30. Life of a cutworm 2 3 J 



31. A maybeetle and its grub ' 2 33 



32. Life stages of a lady-beetle 2 35 



23- Life stages of a wasp 2 3^ 



34. A dragonfly nymph 2 3 8 



35. Various habitats of plant-feeding caterpillars .... 241 



36. External structure of a caterpillar 242 



37. Adult and larval forms of beetles 244 



38. Diagram of insect metamorphosis 246 



39. Springtails 247 



40. A bristletail, Thermobia 248 



41. The relation of a pupa to other insect forms .... 254 



42. Muscle attachment on the body wall 256 



43. Young tent caterpillars 263 



44. Eggs and newly-hatched tent caterpillars 265 



45. First tent of young tent caterpillars 267 



46. Young tent caterpillars on a sheet of silk 268 



47. Mature tent caterpillars feeding 271 



48. Mature tent caterpillars 273 



49. Twigs denuded by tent caterpillars 278 



50. A tent caterpillar jumping from a tree 280 



51. Cocoon of a tent caterpillar 282 



52. Head of a tent caterpillar 284 



53. Jaws of a tent caterpillar 284 



54. Internal organs of a caterpillar 285 



55. The spinning organs of a caterpillar 287 



56. The alimentary canal of a tent caterpillar 288 



57. Crystals formed in the Malpighian tubules 289 



58. The fat-body of a caterpillar 291 



59. Transformation of the tent caterpillar 294 



