CHAP.  PAGE

   I. Introduction 1

  II.  Growth and Change 8

 III.  The Life-stories of some Sucking Insects 16

  IV.  From Water to Air 23

   V. Transformations, Outward and Inward 35

  VI.  Larvae and their Adaptations 49

 VII.  Pupae and their Modifications 79

VIII.  The Life-story and the Seasons 89

  IX.  Past and Present—­the Meaning of the Story 105

       Outline Classification of Insects 122

       Table of Geological Systems 123

       Bibliography 124

       Index 129

LIST OF ILLUSTRATIONS

Stages in the Transformations of a Gnat Frontispiece

Fig page 1.  Stages of the Diamond-back Moth (Plutella 3
    cruciferarum)

 2.  Head of typical Moth 5

 3.  Head of Caterpillar 5

 4.  Common Cockroach (Blatta orientalis) 12

 5.  Nymph of Locust (Schistocera americana) 13

 6. Aphis pomi, winged and wingless females 19

 7.  Mussel Scale-Insect (Mytilaspis pomorum) 21

 8.  Emergence of Dragon-fly (Aeschna cyanea) 29-31

 9.  Nymph of May-fly (Chloeon dipterum) 33

10.  Imaginal buds of Butterfly 39

11.  Imaginal buds of Blow-fly 43

12.  Carrion Beetle (Silpha) and larva 51

13.  Larva of Ground-beetle (Aepus) 52

14.  Willow-beetle (Phyllodecta) and larva 53

15.  Cabbage-beetle (Psylliodes) and larva 54

16.  Corn Weevil (Calandra) and larva 55

17.  Ruby Tiger Moth (Phragmatobia fuliginosa) 61

18.  Larvae and Pupa of Hive-bee (Apis mellifica) 65

19.  Larva of Gall-midge (Contarinia nasturtii) 68

20.  Crane-fly (Tipula oleracea) and larva 69

21.  Maggot of House-fly (Musca domestica) 71

22.  Ox Warble-fly (Hypoderma bovis) with egg,
    larva, and puparium 75

23.  Pupa of White Butterfly (Pieris) 85