210 BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 



1570. RILEY, C. V. Continued. 



THE ARMY-WORM, Leucania unipuncta 47 



Further notea and experiments thereon, 47 Two generations pro- 

 duced annually at St. Louis, and a probable third generation, 

 exceptionally, 48 Summary of its natural history, 49. 

 THE WHEAT-HEAD ARMY-WORM, Leucania albilinea 50 



A new enemy to wheat, 50 First complaint of it in the East, 51 

 First appearance in Kansas, 51 Habits and natural history, 52 

 The egg differs from that of the army-worm, 53 Wherein the 

 worm is distinguished from its destructive congener, 54 Two 

 broods each year, 54 Natural enemies, 54 Remedies, 55 De- 

 scriptive, 55. 

 THE ROCKY MOUNTAIN LOCUST, Caloptenus spretus. .. 57 



It continues to interest the people of the West, 57 Previous opin- 

 ions j nstified, 57 The invasion of 1876, 59 Few in British Amer- 

 ica, 59 Condition of things in Montana, 59 In Wyoming, 59 

 in Dakota, 59 In Minnesota, 60; locusts and alkali soil, 61; 

 good done by Governor Pillsbury, of Minnesota, 61 In Colorado, 

 62 In Iowa, 03 In Nebraska, 64 In Kansas, 65 In Missouri, 

 66 Flights in opposite directions at the same time, 66 Coun- 

 ties in Missouri that were overrun, 67 Red-legged locust trou- 

 blesome in east Missouri, 68 Detailed reports from counties in 

 Missouri, 68 Andrew County, 68 Atchison County, 68 Barry 

 County, 68 Barton County, 69 Bates County, 69 Benton 

 County, 69 Buchanan County, 69 Cass County, 69 Cedar 

 County, 70 Caldwell County, 70 Clay County, 70 Dade 

 County, 70 De Kalb County, 70 Gentry County, 70 Greene 

 County, 71 Harrison County, 71 Henry County, 71 Hickory 

 County, 71 Holt County, 71 Jasper County, 72 Jackson 

 County, 73 Johnson County, 73 Lafayette County, 73 Law- 

 rence County, 73 McDonald County, 74 Newton County, 74 

 Nodasvay County, 74 Pettis County, 74 Platte County, 74 

 Polk County, 75 Ray County, 75 Saint Clair County, 75 Ver- 

 non County, 75 In Indian Territory, 76 In Texas, 76 In Arkan- 

 sas, 76 Destination of the departing swarms of 1875, 77 They 

 reached into British America, 78 Source of the swarms of 1876, 

 79 Eastern line reached, 80 Rate at which the insects spread, 

 80 Direction of flight, 81 Influence of wind in determining 

 the course of locust swarms, 81 Locust flights east of the Mis- 

 sissippi, 81 Geographical range of species, 82 Causes which 

 limit the spread of the Rocky Mountain locust, 83 Flights of 

 Acridium americanum, 84 Does the female of the Rocky Mount- 

 ain locust lay more than one egg-mass?, 85 How the eggs are 

 laid, 86 Philosophy of the egg-mass, 87 How the young locust 

 escapes from the egg, 88 How it escapes from the ground, 90 

 Additional natural enemies, 91 Animals which destroy the eggs, 

 91 The Anthomyia egg-parasite, 92 The common flesh-fly, 95 

 Other undetermined enemies of the eggs, 96 Insects which de- 

 stroy the active locusts, 98 Experiments with the eggs and 

 conclusions therefrom, 99 Experiments to test the effects of 

 alternately freezing and thawing, 99 Experiments to test the 

 influence of moisture upon the eggs, 104 Experiments to test 

 the effects of burying at different depths and of pressing the 

 soil, 104 Experiments to test the effects of exposure to the free 

 air, 104- The Omaha conference, 106 Remedies and suggestions, 

 108 Des ruction of the young or unfledged locusts, 108 Protec- 



