BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 
271 
[Riley, C. V,]—Continued. 
Chapter IV — Continued. 
105—Dry condition of the atmosphere, 105-106 — Arid condition 
of the mountain region, 106-107—Immediate causes of migration, 
107-108. 
Chapter Y: By C. Thamas. 
Influence of meteorological conditions on the development and mi¬ 
grations of locusts. 109 
Influence of heat and dryness, 109-110—Packard’s table of locust 
years, 111-112—Table of rain-falls for 1860 to 1866,112—Influence 
of the rainfall, especially in 1864,112-116—Average monthly tem¬ 
perature for 1864 and 1866,113-115—Rain-fall of the years 1863 to 
1867,116—Temperature of the years 1863 to 1867,117—Extreme 
variations of monthly mean temperature from 1863 to 1867, 
118-119—Monthly and annual mean temperature from 1872 to 
18^6,119-121—Monthly and annual rain-fall from 1872 to 1878,122- 
124— Extreme fluctuations between monthly mean temperature, 
125- 126—Greatest variations between monthly mean tempera¬ 
tures, 126—Variations of temperature between months of con¬ 
secutive years, 127-128—Daily temperature at Fort Sully from 
1872 to 1875, 129-134—Relation of temperature to the develop¬ 
ment of the eggs, 135-136—Professor Riley’s experiments, 137— 
Professor Abbe’s theory on the subject discussed, 137-140—Table 
showing temperature and direction and velocity of wind at 
Western stations, 141-154—Relation of temperature and winds to 
locust flights, 155. 
Chapter VI: By A. S. Packard. ' 
The southern limits of the distribution of the Rocky Mountain locust. 156 
Few locusts permanently breeding in New Mexico and none iu Ari¬ 
zona, 15 6—Caloptenus spretus probably not iu southern New Mex¬ 
ico, central and southern Arizona, etc., 156—History of locust 
invasions in New Mexico from 1864 to 1879, 157-159—Southern 
range of the locust in Mew Mexico, 159—Changes in the map in 
the Report I, showing the distribution of the locust, 159-160. 
Chapter VII: By A. S. Packard. 
Summary of locust flights from 1877 to 1879.. 150 
General remarks on maps Nos. 2 to 4, 160-161—Flights of locusts 
in 1878, 161-162-Flights in 1879, 162-163. 
Chapter VIII: By A. S. Packard. 
The western cricket.. 163 
Difference in habits between the western cricket and the locust, 
163—Occurrence of Anabrus purpurascens, 163-164 ; of A. simplex, 
164—Mode of egg-laying, 164—Movements of an army of the west¬ 
ern cricket, 164-165—Its ravages, 165-166—Its food, 166—Its ene¬ 
mies and parasites, 166—Its breeding 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 : By A. S. Packard. 
The air-sacs of locusts with reference to their powers of flight . 178 
History of the study of the air-saes, 178—Air-sacs in different in¬ 
sects, 178-179—The air-sacs of the Avridii, 179—Use of the air- 
sacs in flight, 179-182—Their origin, 182-183 , 
