Contents. 



sating good, 108. — Changes that follow the locusts, 109. — 

 The prevalence of large green worms, 110. — The sudden 

 appearance of a peculiar grass, 110. 



5 



CHAPTER VII. 



PAGE 



Natural Enemies of the Rocky Mountain Locust 113 



Birds and other vertebrate animals, 113. — The good offices 

 of birds, 113. — Invertebrate animals, 114. — Animals that 

 attack the eggs, 115.— The Silky Mite, 115.— The Antho- 

 myia Egg-parasite, 118. — The common Flesh-fly, 123. — 

 Undetermined larvae, 123. — Ichneumon-flies, Ground-bee- 

 tles, Click-beetles and Myriapods, 126. — Insects that destroy 

 the active locust, 126. — The Locust-mite, 128. — The Anony- 

 mous Tachina-fly, 131. — Yellow-tailed Tachina-fly, 134. — 

 Flesh-fly, 135. 



CHAPTER VIII. 



Practical Considerations 139 



How best to prevent locust injuries, 139. — Encourage- 

 ment of natural enemies, 139. — Destruction of the eggs, 

 139. — Experiments with the eggs, and conclusions drawn 

 therefrom, 140. — Effects of alternately freezing and thaw- 

 ing, 141. — Influence of moisture, 143. — Exposure to the free 

 air, 148. — Burying at different depths, and pressure of the 

 soil, 149. — Table of temperatures, 152. — Harrowing in the 

 fall, 153. — Collecting the eggs, 153. — Plowing; how most 

 effectual, 153. — Irrigation, Tramping, 154. — Destruction of 

 the young or unfledged Locusts, 155. — Burning, 155. — 

 Crushing, 157. — Trapping, 157. —Ditching and trenching, 

 161. — Catching, 161 — Different contrivances for this pur- 

 pose, 162. — Use of destructive agents, 162. — Coal-oil pans, 

 163. — The use of coal tar, 164. — The protection of plants 

 by special applications, 165. — The best means of protect- 

 ing fruit and shade trees, 166. — Sulphur fumes and smudges, 

 167. — Destruction of the winged locusts, 167. — Preventive 

 measures, 169. — Suggestions that may prove of service, 

 170. — Use of hogs and poultry, 171. — The Signal Service, 

 172.— Military aid, 173. — Diversified agriculture, 174.— 

 Organized effort, 176. — State legislation, 176. — Missouri 

 locust-law, 177. — Kansas locust-laws, 178, 179. — Minnesota 

 locust-law, 180. — Nebraska locust-law, 184. — How to avert 

 locust invasions, 186. 



