BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 271 



1959. [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 V : 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 i860 to 1866, 112 Influence 

 of the rainfall, especially in 1864, 112-113 Average monthly tem- 

 perature for 1864 and 1866, 113-115 Eain-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 



1876, 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 in Ari- 

 zona, 156 Caloptenus spretus probably not in 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 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 : 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 Anabrw, 

 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 Acridli, 179 Use of the air- 

 sacs in flight, 179-133 Their origin, 182-183 , 



