x Contents 



CHAPTER VI 



PAGE 



DRAGON-FLIES AND DAMSEL-FLIES (ORDER ODONATA) 75 



Characteristics and distribution of dragon-flies, 76. Structure of adults, 79. 

 Habits, 81. Life-history, 84. Methods of collecting and studying, 87. Various 

 kinds of dragon-flies, 89. Keys to suborders, 89. Key to families of Zygoptera, 

 89. Key to families of Anisoptera, 91. 



CHAPTER VII 



TERMITES OR WHITE ANTS (ORDER ISOPTERA) 99 



Characteristics and structure of Termites, 99. Life-history, 101. Key to 

 genera, 102. Habits and characteristics of various kinds of termites, 102. 

 Termites of Africa, 106. The problem of caste determination, 108. The 

 Embiidae, 109. 



CHAPTER VIII 



BOOK-LICE AND BARK-LICE (ORDER CORRODENTIA) AND THE BITING BIRD-LICE 



(ORDER MALLOPHAGA) in 



Structure and life-history of book-lice, in. Keys to families and genera, 

 112. Characteristics and life-history of bird-lice, 113. Problems of distri- 

 bution, 116. Keys to suborders, families, and genera, 118. Various species, 

 119. 



CHAPTER IX 



THE COCKROACHES, CRICKETS, LOCUSTS, GRASSHOPPERS, AND KATYDIDS (ORDER 



ORTHOPTERA) 123 



Sounds of crickets, etc., 123. Key to families, 126. Cockroaches or Blat- 

 tidae, 126. Mantidae, 129. Phasmidae, 132. Key to genera of Phasmida;, 

 132. Locusts (Acridiidae), 133. Sounds of locusts, 134. Life-history of 

 locusts, 136. Key to subfamilies of Acridiidae, 136. Rocky Mountain locust, 

 137. Various kinds of locusts, 140. Locustidae, 149. Various kinds, 150. 

 Crickets (Gryllidae), 157. Sound-making of crickets, 157. Ear-wigs (Forficu- 

 lidae), 162. 



CHAPTER X 



THE TRUE BUGS, CICADAS, APHIDS, SCALE-INSECTS, ETC. (ORDER HEMIPTERA), 



AND THE THRIPS (ORDER THYSANOPTERA) 163 



Characteristics of Hemiptera, 164. Key to suborders, 165. Key to families 

 of Homoptera, 166. Cicadas (Cicadidae), 166. Tree-hoppers (Membracida?) 

 and lantern-flies (Fulgoridae), 168. Leaf-hoppers (Jassidse), 169. Spittle 

 insects (Cercopidas), 170. Jumping plant-lice (Psyllidse), 171. Plant-lice 

 (Aphidiidae), 171. Grape-phylloxera, 176. Scale-insects (Coccidae), 180. San 

 Jose scale, 181. Remedies for scale-insects, 189. Mealy-winged flies (Aleyro- 

 -didas), 190. Key to families of Heteroptera, 194. Water-striders (Hydroba- 

 tidae), 196. Water-boatmen (Corisidaa), 198. Back-swimmers (Notonectidae), 



