TABLE OF CONTENTS. V 



Pago. 

 Habits and natural history.— Continued. 



swarms from the Temporary region retrace their course? 240 — The species 

 essentially single-brooded, 240-243 — Reasons "why it cannot produce two 

 generations annually, 243 — The species cannot permanently dwell in the 

 Temporary region, 244 — The insects which hatch there do not remain, 

 246 — Extensive and thick egg-laying seldom occurs twice consecutively 

 in the same locality, 247 — Reasons why it does not, 248 — Causes of migra- 

 tion, 249 — Food-plants, 251 — Crops and plants most liked and those least 

 liked, 252-254 — Unnecessary alarm caused by comparatively harmless 

 species, 255. 



CHAPTER IX. 



Anatomy and embryology 257 



External anatomy, 257— Divisions of the body, 258 — Sexual differences, 259 — 

 Internal anatomy, 261 — The digestive system, 262-254 — The nervous sys- 

 tem, 264— The heart, 266 — The trachese and dilated air-sacs, 267 — Mode of 

 breathing, 269 — The locust an aeronaut, 270 — The male reproductive sys- 

 tem, 270 — The female reproductive system, 271 — Organs of special sense, 

 272 — The fine anatomy of the locust, 273 — Embryology of the Rocky Mount- 

 ain locust, 277 — Different egg-layers, 278 — How the embryo lies within the 

 egg, 278 — How it bursts the egg, 279. 



CHAPTER X. 



Metamorphoses 279 



The six stages of growth, 279 — Variability in the depth of coloring, 281— The 

 process of molting, 281— Time required for it, 233 — Differences in the im- 

 mature stages between the Rocky Mountain, the Lesser, and the Red-legged 

 locusts, 283. 



CHAPTER XL 



Invertebrate enemies 284 



Value of the locust's minute enemies, 284 — Animals that destroy the eggs, 285 

 — The Anthoviyia egg-parasite, 285 — The common flesh-fly, 289 — Ground- 

 beetles and their larvae, 289 — Harpalus larvae, 289 — The egg-feeding Amara, 

 291 — Blister-beetle larvae, 292 — Their character and locust-egg-feeding 

 habits, 293 — History of the oil-beetle, 294 — History of Sitaris, 295 — History 

 of Hornia, 296 — History of Epicauta, 297 — Macrohasis and Henous, 301 — 

 Other meloid genera, 302 — Soldier-beetle larvae, 302 — Asilid larvae, 303 — 

 Click-beetle larvae, 304 — Miscellaneous species, 305 — Chalcid-fly , 306 — Ani- 

 mals that prey on the locust after it is born, 306 — The locust mite, 306 — 

 The efficacy of its work, 308 — Its transformations, 309 — Other mites, 312- 

 313— Ground-beetles, 313— Tiger-beetles, 314— Asilus-flies, 317— Digger- 

 wasps, 317 — Tachina-flies, 319 — Their efficacy in destroying locusts, 321 — 

 Flesh-flies, 323 — Ichneumon-flies, 324 — Hair-worms, 326 — Their curious life- 

 history, 327-332 — Insects attacked by hair-worms, 327 — How hair-worms 

 get into locusts, 332 — Miscellaneous locust enemies, 334. 



CHAPTER XII. 



Vertebrate enemies 334 



Good offices of birds probably underrated, 234— Experience of correspond- 

 ents, 336 — Some of the most useful birds, 338 — Paper by Professor Aughey 

 on the beneficial work of birds, 338 — Enormous number of birds destroyed 

 for market, 346 — Damage done to insectivorous birds by birds of prey, 

 348 — The English sparrow, 349 — What public sentiment needs, 349. 



