.. 



xii TABLE OF CONTENTS. 



PAGE 



Thetestes, 34 



The egg 34 



Growth of the insect within the egg, 35 



The egg-cutter, 38 



Metamorphosis of insects the larva, 38 



Number of larval moults, ... 39 



The pupa, 40 



The imago, 41 



Parthenogenesis, 41 



Broods or generations of insects, 42 



Contagious diseases of insects due to animal and vegetable germs, . 42 



The destruction of insect pests by means of insect fungi, .... 45 



Unusual increase in the number of insects, 48 



Influence of changes of temperature on insect-life, 49 



Periodicity in insect-life, 52 



Number of species of insects 52 



CHAPTER III. 



CLASSIFICATION OF INSECTS. 54-177 



Synopsis of the orders of insects, 54 



Tabular view of the orders of insects, 56 



Order I. Thysanura, 56 



Order II. Dermaptera, 58 



Order III. Orthoptera, 59 



Order IV. Platyptera, 63 



Order V. Odonata, 68 



Order VI. Plectoptera, 71 



Order VII. Thysanoptera, 73 



Order VIII. Hemiptera, 74 



Order IX. Neuroptera, 84 



Order X. Mecaptera, 88 



Order XL Trichoptera, 90 



Order XII. Coleoptera, 91 



Order XIII. Siphonaptera, 115 



Order XIV. Diptera 117 



Order XV. Lepidoptfra, 137 



Order XVI. Hymenoptera, 161 



