CONTENTS 



CHAPTER IV 



Arkaxgement of Internal Organs Muscles Nervous System Gang- 

 lionic Chain Brain Sense- Organs Alimentary Canal Mal- 

 piGHiAN Tubes Respiration Tracheal System Function of 

 Respiration Blood or Blood-chyle Dorsal Vessel or Heart 

 Fat-body Ovaries Testes Parthenogenesis Glands . . .114 



CHAPTER V 



development 



Embryology Eggs Micropyles Formation of Embryo Ventral 

 Plate Ectoderm and Endoderm Segmentation Later Stages 

 Direct Observation of Embryo Metamorphosis Complete and 

 Incomplete Instar Hypermetamorphosis Metamorphosis of 

 Internal Organs Integument Metamorphosis of Blowfly His- 

 tolysis Imaginal Discs Physiology of Metamorphosis Ecdysis . 143 



CHAPTER VI 



Classification The Nine Orders of Insects Their Characters- 

 Packard's Arrangement Brauer's Classification Classifications 

 based on Metamorphosis Super-Orders The Subdivisions of 

 Orders 171 



CHAPTER VII 



The Order Aptera Definition Chief CHARACTERfsTics Thysanura 

 Campodea Japyx Machilis Lepisma Diversity of Internal 

 Structure in Thysanura Ectoteophi and Entotrophi Collem- 

 BOLA Lipuridae Poduridae Smynthuridae The Spring The 

 Ventral Tube Abdominal Appendages Prostemmatic Organ 

 Tracheal System Anurida maritima Collembola on Snow 

 Life-Histories of Collembola Fossil Aptera Aptebygogenea 

 Antiquity and Distribution of Campodea 180 



CHAPTER VIII 

 Orthoptera Forficulidae, Earwigs Hemimeridae .... 198 



