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