xii CONTENTS 



CHAPTER XX 



PAGE 



THE STREPSIPTERA 150 



General description Distinctive characters Habits Life history Abun- 

 dance Importance. 



CHAPTER XXI 



THE THYSANOPTERA 153 



General features Structure Distinctive characters Habits Subdivisions 

 Wheat Thrips Onion Thrips Pear Thrips Citrus Thrips. 



CHAPTER XXII 



THE CORRODENTIA 159 



General description Structure Distinctive characters Book lice 

 Psocids Importance of the group. 



CHAPTER XXIII 



THE MALLOPHAGA 161 



General features Distinctive characters Habits Poultry lice Control. 



CHAPTER XXIV 



THE ANOPLURA 164 



Description Distinctive characters Distribution Life history Body 

 louse Relation of lice to disease Crab louse Lice on domestic animals 

 Control. 



CHAPTER XXV 



THE HEMIPTERA 168 



General characters Structure of mouthparts Distinctive characters 

 Distribution Habits Pentatomidse Harlequin Bug Cydnidse Coreidaj 

 Squash Bug Pyrrhocoridre Cotton Stainer Lygseida3 Chinch Bug 

 The diseases of Insects Tingitidte Miridse Meadow Plant Bug Tarn- 

 ished Plant Bug Phymatidse Reduviidse Cimicida3 Bedbug Gerridae 

 Notonectidae Corixidae Nepidae Belostomidae. 



CHAPTER XXVI 



THE HOMOPTERA 186 



General statements Distinctive characters Variations in habits etc. 

 Honey dew Classification of the order Cicadidse Periodical Cicada or 

 17-year Locust Leaf Hoppers and Tree Hoppers Apple Leaf hoppers 

 Rose Leaf hopper Chermidse Pear Psylla Aphididaa in general Apple 

 Aphids Grape Phylloxeras-Corn Root Aphis Aleyrodidse Coccidse 

 in general Armored Scales Oyster-shell Scale Scurfy Scale San Jose 

 Scale Rose Scale Pine Leaf Scale Purple Scale Red Scale Soft 

 Scales Black Scale Terrapin Scale Cottony Maple Scale Hemispherical 

 Scale Mealy Bugs Citrus Mealy Bug Long-tailed Mealy Bug Cottony 

 Cushion Scale Introduction of enemies of introduced pests. 



