BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 311 



2232. EILEY, C. V. Continued. 



CAUSES OF DESTRUCTION OF EVERGREEN FORESTS, ETC. Continued. 

 The hemlock gelechia, Gelechia bietisella 150 



Habits, 151 Description of ]arva, pupa, aud moth, 151. 

 EXPERIMENTS ON SCALE INSECTS, WITH PRACTICAL SUGGESTIONS, BY 



H. G. HUBBARD 152 



Report of progress in experiments, 152 Soap emulsions, 152 Ker- 

 osene and soap emulsions, formula, 152 Receipt for making 

 emulsions of kerosene and soap, 152 Introduction and use of the 

 cyclone nozzle, 152 Effects of kerosene emulsions upon plants, 

 153 Effects of kerosene emulsions varied by change of weather, 

 153 Most favorable season for applying kerosene emulsions, 

 153 Application of liquid insecticides, 153 The cyclone nozzle, 

 154 Cost of kerosene wash, 154. 

 Recent experiments 155 



Potash compared with soda as an insecticide, 155 Details of ex- 

 periments with potash, 155-156 Experiments with soda, 156. 

 Introduction and spread of scale insects 156 



Great vitality of bark-lice, 156 Importation on live trees, 157 

 Precautionary measures ; infection from nursery stock, 157 Pro- 

 tection afforded by hedges and forest trees, 158. 



MISCELLANEOUS INSECTS 159 



The imported elm-leaf beetle, Galeruca xanthomelcena - 159 



Range, 159 An importation from Europe, 160 Habitg and natu- 

 ral history, 160 Remedies, 161 Natural enemies, 163 More re- 

 cent experiments at the Department, 164 Past history of the 

 elms on Department grounds, 164 Condition and characteris- 

 tics of the grove in 1882 and 1883, 164 Extent of injury in 1882 

 and 1883, 164 Preferences of the elm-beetle for certain varieties 

 and species of elms, 165 Effects of arsenical poisons on insect 

 and plant, 165 Preventive effects of the poison, when best ap- 

 plied, 166 Treatment with London purple, 166 Preparation of 

 the poison, 166 Effects of the mixture, 167 Treatment with 

 Paris green, 167 Mechanical means of applying the poison, 

 168 The eddy-chamber nozzle, 168 Hose and bamboo combina- 

 tion, 169. 

 The lesser migratory locust, Caloptenus atlanis 170 



Its ravages in the Merrimac Valley, 170 Historical, 170 Charac- 

 ters, 172 Range and life-history, 173 Natural enemies, 174 

 Remedies, 175 Destruction of eggs, 175 Destruction of young, 

 175 Coal oil, 175 Machines, 175-177 Coal tar, 177 Catching 

 or bagging, 178 Protection of vegetable gardens, 179 Necessity 

 for co-operation, 180. 



2233. EILEY, C. V. The imported orchard Scolytus (Scolytus rugulosus 



Eatz.). <Thomasville [Ga.j Times, 10 November, 1883. S.-b. 

 No. 56, p. 182. 



Answer to inquiry ; S. rugulosus bores in twigs of pear ; means against it. 



2234. EILEY, C. V. Osage orange vs. mulberry for the silk-worm. 



<Sci. Amer., 17 November, 1883, v. 49, p. 305. S.-b. No. 42, 

 p. 91. Eeprint : < Amer. Nat., 5 January, 1884, v. 18, pp. 78- 

 79. <Prairie Farmer, 22 March, 1884, v. 56, p. 187. S.-b. No. 

 42, p. 118. 



Comparative value of leaves of Madura aurantiaca and of Morus as food for 

 Sericana mori ; critical review of V. des Lauriers's conclusions. 



