CONTENTS 



CHAPTER I 



PAGE 



SlRUCTDRE AND SPECIAL PHYSIOLOGY OF INSECTS I 



Structural characteristics of the class Insecta, 3. External anatomy, 4. 

 Bodv-wall, 4. Divisions of body, 5. Mouth-parts, 8. Wings, 9. Size and 

 form of body, 12 Internal anatomy, 13. Muscles, 13. Alimentar>' canal, 

 13. Reproductive system, 14. Circulatory system, 16. Respiratory system, 

 ig. Nervous system, 20. Special sense-organs, 24. Insect psychology, ;}^. 



CHAPTER II 



Development and Metamorphosis 35 



Eggs and embryonic development, 36. Post-embryonic development, 40. 

 Development without metamorphosis, 41. Development with incomplete meta- 

 morphosis, 41. Development with complete metamorphosis, 43. Internal 

 changes during development, 47. Significance of development, 49. 



CHAPTER III 



Classification of Insects 52 



Various schemes of classification into orders, 52. Analytical key to the orders 

 of insects, 54. 



CHAPTER IV 



The Simplest Insects (Order Aptera) 58 



Fish-moths and springtails, 58. Priraitiveness among insects, 59. Struc- 

 tural characteristics, 59. Key to the suborders, 60. Thysanura, 60. Key to 

 the families of Thysanura, 60. Key to genera of Lepismid^, 61. Collembola, 

 62. Key to families of Collembola, 63. 



CHAPTER V 



May-flies (Order Ephemerida) and Stone-flies (Order Plecoptera) 65 



May-fly swarms, 65. Life-history, 66. Structure of adults, 68. Stone-flies, 

 70. Life-history, 71. Structure of adults, 71. Table of North American 

 genera of Plecoptera, 73. 



ix 



