360 Bulletin No. 112. IJanuary,' 



emulsion. For a mixture containing lo per cent, of kerosene, add 

 seventeen gallons of water to the three gallons thus prepared. For 

 an 1 8 per cent, kerosene emulsion, add eight gallons of water to the 

 stock solution. Soft water is to be preferred. 



lo. The principal insect enemies of the cottony maple scale are 

 minute winged parasites which lay their eggs within the bodies of 

 the female parents ; and hemispherical shining black ladybugs, each 

 with two red spots on the back, the larvae of which devour the eggs 

 in spring within the cottony masses beneath the female body. 



