C O N T E N TS. 



PA RT I. 



STRUCTURE AND CLASSIFICATION. 

 CHAPTER I. 



PAGE 



The General Structure of Insects , . . ii 



CHAPTER II. 

 Ihe Head and its Appendages 14 



CHAPTER III. 

 Thorax and Abdomen 23 



CHAPTER IV. 

 Muscles, Digestion, and Circulation 27 



CHAPTER V. 

 The Respiratory System 33 



CHAPTER VI. 

 Nervous System and Senses of Insects 39 



CHAPTER VII. 

 The Reproductive System . • 45 



CHAPTER VIII. 



Growth and Metamorphosis 48 



iii 



