BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 
311 
V 
2232. Riley, C. V.—Continued. 
Causes of destruction of evergreen forests, etc.— Continued. 
The hemlock gelechia, Gelediia obietisella . 150 
Habits, 151—Description of larva, pupa, and moth, 151. 
Experiments on scare 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 iusecticides, 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 xantliomdasna . 159 
Range, 159—An importation from Europe, 160—Habits 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—Preveutive 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, Calopienus 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. Riley, C. Y. The imported orchard Scolytus ( Scolytus rugulosus 
Ratz.). <Thomasville [Ga.] Times, 10 November, 1883. S.-b. 
No. 56, p. 182. 
Answer to inquiry; S. rugulonis bores in twigs of pear; means against it. 
2234. Riley, C. Y. Osage orange vs. mulberry for the silk-worm. 
<Sci. Amer., 17 November, 1883, v. 49, p. 305. S.-b. No. 42, 
p. 91. Reprint: <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 Machtra aurantiaca and of Moras as food for 
* Sericaria mori: critical review of V. des Lauriers’s conclusions. 
