TABLE OF CONTENTS xvii 



l6. THE SUSPENSORIA OF THE VISCERA 



The dorsal diaphragm 1 62 



The ventral diaphragm 165 



The thread-like suspensoria of the viscera 163 



17. SUPPLEMENTARY DEFINITIONS 



The oenocytes 163 



The pericardial cells 164 



The phagocytic organs 164 



The light-organs 165 



CHAPTER IV 



The Metamorphosis of Insects 166 



I. the EXTERNAL CHARACTERISTICS OF THE METAMORPHOSIS OF INSECTS 



a. The egg 1 66 



The shape of the egg 167 



The sculpture of the shell 167 



The microphyle 167 



The number of eggs produced by insects 168 



Modes of laying eggs 168 



Duration of the egg-state 170 



b. The hatching of young insects 171 



The hatching spines 171 



c. The molting of insects 171 



General features of the molting of insects 171 



The molting fluid 172 



The number of postembryonic molts 172 



Stadia 172 



Instars 172 



Head measurements of larva; 173 



The reproduction of lost limbs 173 



d. Development without metamorphosis 174 



The Ametabola 174 



e. Gradual metamorphosis 175 



The Paurometabola 176 



The term nymph 176 



Deviations from the usual type 176 



The Saltitorial Orthoptera 177 



The Cicadas 177 



The Coccidae 177 



The Aleyrodida; 177 



The Aphididse 177 



The Thysanoptera . 177 



/. Incomplete metamorphosis 178 



The Hemimetabola 179 



The term naiad 179 



Deviations from the usual type 1 80 



The Odonata 180, 



The Ephemerida ,,.,,... 180 



