210 BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 
1570. Riley, C. Y.—Continued. 
The army-worm, Leucania unipuncta __-. 47 
Farther notes 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 justified, 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, 63—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— 
Nodaway 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 Authomyia 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- 
