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 — Coreidae 

 — Squash Bug — Pyrrhocoridte — Cotton Stainer — Lygaiidse — -Chinch Bug 

 — The diseases of Insects — Tingitidaj — Mirida — Meadow Plant Bug — ^Tarn- 

 ished Plant Bug — ^Phymatida? — Reduviida? — Cimicidaj — Bedbug — Gerridre 

 — Notonectidae — Corixidaj — Nepidir — Belostomida>. 



CUIAPTER 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 — ^Chermidae — Pear Psylla — Aphididse in general — Apple 

 Aphids — -Grape Phylloxera — -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. 



