234 



Index. 



Direction in which young locusts 

 travel - 100 



Direction taken by departing 

 swarms of spretus 103 



Distinguishing characters of Rocky 

 Mountain Locust and. Red-legged 

 Locust 15 



Ditch for trap, size important 160 



Ditching and trenching as safe- 

 guards against spretus 157 



Diversified agriculture desirable... 174 



E 



Early visitations of Rocky Moun- 

 tain Locust 33 



Eastern limit of locust invasions, 53, 203 

 Effects of young of spretus, where 



hatched 107 



Egg-mass of spretus, construc- 

 tion of 71 



Egg-masses of spretus, how many 



formed by one female 72 



Eggs of spretus, how laid 69 



" " where laid 96 



" " when hatched 97 



" " experiments witb, 140 

 14 " methods of de- 

 stroying ..139 



Eirg-parasites of spretus 117 



Eggs of Silky Mite 116 



Embryon of spretus, growth and 



appearance of 74 



Eragrostis poceoicles 110 



Erax bastardii 128 



Escape of spretus from egg 73 



Exorista Jlavicauda 134 



Experiments with eggs— 



BuryiDg 140 



Exposure to air 148 



Freezing and thawing 141 



Soaking and drying 143 



F 



Fall harrowina: 153 



Famine and epidemics consequent 



on locust invasions 30 



Fasting and prayer... 213 



Femur-rubrum, dcstructiveness of. 



in 1869 _ 38 



Field Mouse, eats locust-eggs Ill 



Flesh-fly 123, 135 



Flight of spretus, direction of 96 



" " extent of 85 



Flight of spretus, noise of S7 



" sometimes noc- 

 turnal 83 



Food plants of spretus 89 



Freezing and thawing eggs of 



spretus . 141 



Fruit trees, how protected 165 



" " injuries to 93 



G 



Gordius aquations 114 



Granulated grouse-locust 230 



Grasshopper vs. locust.. 207 



Great-crested Fly-catcher 114 



Green-striped locust 229 



Green variety of Rocky Mountain 



locust . 27 



H 



Habits of young of spretus 98 



Hard soil, why preferred for pur- 

 pose of oviposition 77 



Harpalus, larvse ef, devour eggs of 



spretus .125, 126 



Harrowing locust-egsjs 153 



Harpalus Pennsylvanicus 127 



History of locust ravages in 



America 33 



Hogs as destroyers of locusts 171 



Hymenopterous larva, parasitic on 

 eggs of Rocky Mountain Locust. 123 

 I 



Ichneumons, probably parasitic on 



locusts 128 



Imago of spretus, flexibility of 



newly developed legs of 81 



Influence of moisture on locust- 

 eggs 143 



Intervals of oviposition 73 



Invasion of 1818-19 33 



1815-49..... 34 



" 1S55-72..; 34—38 



1874 39 



1875 42 



1876 , 49 



Invertebrate locust enemies 115 



Irrigation 154, 171 



J 



Joel the prophet's description of 



locust fligh S — 87 



K 



Kansas locust-laws. 178, 179 



Kerosene, use of, as a locust-de- 

 stroyer 162 



