TABLE OF CONTENTS. V 
CHAPTER VI. 
Page. 
The southern limits of the distribution of the rocky mountain 
locust 156 
Few locusts permanently breeding in New Mexico, and none in Arizona, 
156 — Caloptenus spretua probably not in Southern New Mexico, Central and 
Southern Arizona, &c, 156 — History of locust invasions in New Mexico 
from 1864 to 1879, 157-159 — Southern range of the locust in New Mexico, 
159 — Changes in the map in Report I, showing the distribution of the 
locust, 159, 160. 
CHAPTER VII. 
Summary of locust flights from 1877 to 1879 160 
General remarks on Maps Nos. 2 to 4, 160, 161 — Flights of locusts in 1878, 
161, 162— Flights in 1879, 162, 163. 
CHAPTER VIII. 
The western cricket 163 
Difference in habits between the western cricket and the locust, 163 — Occur- 
rence of Anabrus purpurascens, 163,164 — of A. simplex, 164 — Mode of egg- 
laying, 164 — Movements of an army of the western cricket, 164, 165 — Its 
ravages, 165, 166 — Its food, 166 — Its enemies and parasites, 166 — Its breed- 
ing habits, 166, 167— Remedies, 167, 168— Geographical distribution of the 
species of Anabrus, 168, 169 — Synopsis of the species of Anabrus and its 
allies, 169, 170 — External anatomy of Anabrus, 170 — the head, 170-172 — 
the thorax, 172-174 — the abdomen, 174, 175 — Internal anatomy of Anabrus 
purpurascens, 175 — the digestive system, 175,176 — the nervous system, 
176, 177 — the breathing apparatus, 177, 178. 
CHAPTER IX. 
The air-sacs of locusts with reference to their powers of flight 178 
History of the study of the air-sacs, 178 — Air-sacs in different insects, 178, 179 
— The air-sacs of the Acrydii, 179 — Use of the air-sacs in flight, 179-182 — 
Their origin, 182, 183. 
CHAPTER X. 
Histology of the locust (Caloptenus) and the cricket (Anabrus) 183 
Study of histology of insects, 183, 184 — Explanations of Figs. 1 and 2, Plate 
II, 185, 186— The cuticula, 186-188— The epidermis, 188, 189— Sense organs, 
189 — Nervous system, 190 — Tracheae, 191-195 — Air-sacs and spiracles, 195 — 
Muscles, 195, 196 — Organs of circulation, 196 — Connective tissue, 196-198 — 
Ovary, 198-201 — Anterior caecum of the oviduct, 201 — Uterus of locusts, 
201-203— Male organs, 203— Testis, 203, 204— Development of the sperma- 
tozoa, 204-207 — Vasa de/erentia, 207 — Ductus ejaculalorius, 207 — Vesiculm 
seminales, 207, 208— Digestive canal, 208-210— Crop, 210, 211— Proventricu- 
lus, 211, 212— Stomach, 212-214— Diverticula, 214, 215— Gastro-ileal folds, 
215-217— Ileum, 217— Colon, 217, 218— Rectum, 218, 219— Summary on the 
digestive canal, 219-221 — Malpighian vessels, 222. 
CHAPTER XI. 
The brain of the locust 223 
The nervous system in general, 223, 224 — The brain of insects compared with 
that of vertebrates, 224-226 — The brain of the adult locust, 226 — Histologi- 
cal elements of the brain, 226-228 — The sections of the brain, 228-230 — In- 
ternal topography of the brain, 230— The central body, 230, 231 — The 
mushroom bodies, 231-234 — The optic lobes, 234 — The optic ganglion, 234 
