CONTENTS. 



PREFACE .... 



CONTENTS 



LIST OF ILLUSTRATIONS 



INTRODUCTORY . 



EXTERNAL STRUCTURE 



THE HEAD . 



THE THORAX 



THE WINGS . 



THE ABDOMEN 



THE GENITALIA 

 INTERNAL STRUCTURE 



THE GLANDS 



GLANDS IN THE HEAD 

 THORACIC GLANDS 

 ABDOMINAL GLANDS . 



REPRODUCTIVE ORGANS . 



THE CIRCULATORY SYSTEM 



THE RESPIRATORY SYSTEM 



THE MUSCULAR SYSTEM 



THE NERVOUS SYSTEM . 

 LIFE HISTORY . 



PROPAGATION 



COLONY FOUNDING 



METAMORPHOSIS 



PARTHENOGENESIS . 



LARVAE 



PUPAE .... 



POLYMORPHISM 



PAGE 



vii-x 



xi-xii 



xiii-xv 



3-64 



3-15 



3-6 



7-9 



9-11 



9-13 



13-15 



17-26 



18-22 



18-19 



19 



19-24 



22-24 



24 



25 



25 



25-26 

 26-43 

 26-27 

 27-29 

 29-30 

 30 



30-32 

 32-34 

 34-43 



