CONTENTS 



INTRODUCTION 



PART I— THE STRUCTURE, GROWTH AND ECONOMICS 

 OF INSECTS 



Page 



The Branch Arthropoda i 



The Class Insecta 2 



Structure of Insects 2 



External Anatomy 2 



Internal Anatomy 19 



The Development of Insects 30 



Embryology, Metamorphosis — stages 30 



Losses due to Insects 38 



Beneficial Insects 39 



Insects and Birds 44 



Insects and Plants 45 



Insects as Plant Disease Carriers 46 



Insects and Disease 49 



Insect Behavior toward Stimuli 57 



Relation of Insects to Temperature and Humidity 59 



Distribution of Insects 60 



Methods of Studying Economic Insects 64 



PART II.— THE IDENTIFICATION OF INSECTS INJURIOUS TO 

 FARM, GARDEN AND ORCHARD CROPS, ETC. 



Insects injurious to Cereal Crops 71 



Insects injurious to Indian Corn or Maize 72 



Insects injurious to Clover and Alfalfa ' 73 



Insects injurious to Peas and Beans 74 



Insects injurious to Stored Grain Products 74 



Insects injurious to Root Crops 76 



Insects injurious to the Potato Crop 76 



Insects injurious to Garden Vegetables 77 



Insects injurious to the Apple 77 



Insects injurious to the Plum 80 



Insects injurious to the Cherry 82 



Insects injurious to the Peach 83 



Insects injurious to the Raspberry and Blackberry 83 



Insects injurious to the Gooseberry and Currant 84 



ix 



