BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 293 



2319. EILEY, C. V. Continued. 



SILK CULTURE Continued. 



United States, 9 Various reports from correspondents of the 

 division, 9 Experience in 1882 at the Department in raising 

 worms fed on osage orange or mulberry, 11 New mulberry tree 

 from southern Russia, 13 Business ventures in the United States 

 in connection with silk-producing industry, 13 Sale of eggs, 13 

 Second edition of the manual of silk culture, 14 Preface thereof, 

 14 Reasons why the growing interest in silk culture in the 

 United States should be checked at the present time, 15 Import 

 duty on raw silk demanded, 16. 



PYRETHRUM: ITS USE AS AN INSECTICIDE 16 



Circular in reference to Pyrethruin, 16 Distribution of seed by the 

 Department, 16 History of Pyrethrum in Asia and Dalmatia, 

 17 Experience in growing Pyrethrum rosenm in America, 17 

 Soil best adapted for raising the plant, 18 The Dalmatian plant 

 in California, 18 Experience with raising the plant at Washing- 

 ton, 18 Preparation of the plant for use, 18 Gathering and dry- 

 ing the flowers, 18 Pulverizing, 19 Keeping the powder, 19 

 Advantages and disadvantages of the powder as an insecticide, 

 19 How Pyrethrum affects different insects, 19 Modes of ap- 

 plication, 19 Pyrethrum as dry powder, 19 Pyrethrum applied 

 in fumes, 20 Alcoholic extract, 20 The powder stirred up in 

 water, 20 Tea or decoction, 21 Reports from persons to whom 

 Pyrethrum seed was sent, 21 Success in raising the plant at 

 Washington, 24 Miss M. E. Murtfeldt's experiments with pow- 

 der on various insects, 25. 



CHINCH-BUG NOTES, Blissus leucopterus 27 



Professor Thomas' predictions for 1881, 271881 a chinch-bug year, 

 27 Injury in spring of 1882 in the western States, 27 Irriga- 

 tion as remedy, 28 Use of kerosene emulsions, 29. 



THE ARMY WORM, Leucania unipuncta - 29 



Habits and natural history, 30 History of investigation in America, 

 30 Where the eggs are laid, 30 When the eggs are laid, 31 

 Mode of oviposition, 31 Prolificacy of the moth, 32 Duration 

 of the egg state, 32 Habits of the young worms, 32 GueneVs 

 characterization of Leucania larvae, 32 Marching of the worms 

 abnormal, 33 The marching worm not a distinct race, 33 Dura- 

 tion of worm life, 34 Remedies, 34 Burning old grass, 34 

 Predictions of army-worm years unreliable, 35 Meteorological 

 influences on the species, 35 Ditching and fencing as remedies, 

 36 Use of arsenical poisons, 36 Kerosene and coal tar, 36 

 Heavy rolling not to be recommended, 37 "Drawing the rope" 

 of little avail against the worm, 37 Mr. L. O. Howard's report 

 on army-worm injury, 1881, in Illinois and Indiana, 37 Reports . 

 from correspondents, spring of 1882, 39 Rev. Samuel Lock- 

 wood's account of the invasion of 1880, in New Jersey, 44. 



SCALE INSECTS OF THE ORANGE, BY H. G. HUBBARD 46 



Characterization of the species, 16 Comparative destructiveness 

 of the three species treated of, 47 Periods of migration, growth, 

 and incubation, 47 Scale insects easily assailable only daring a 

 brief period of their development, 48 The hatching process and 

 its maximum periods, 48 Great vitality of the eggs, 49 The 

 work of enemies and parasites, 49 Lady-bugs, lace-wings, and 

 lepidopterous enemies, 48 Importance of mites as external 



