xii Contents. 



CHAPTER XXI. 



PACK 



Class 3. Myriopoda, Centipedes, and Gaily- Worms . 112 



CHAPTER XXII. 



Class 4.. Insecta : Insects General Characters and Struc- 

 ture 115 



i 



CHAPTER XXIII. 

 ./ 



Orders of Insects whose Metamorphoses are Imperfect 

 Aphides, Bugs, Straight-winged Insects and Dragon- 

 Flies 123 



i / \ , 



. CHAPTER XXIV. 

 Insects whose Metamorphoses are complete . 127 



INDEX and GLOSS4RY , . 137 



