The Honey Bee and the Fly 



373 



(Any of the following must be applied frequently, as few will keep 

 flies away for more than a day or two following their application.) 



One pound rancid lard, one-half pint kerosene. 



Mix until a creamy mass forms. Best applied with cloth or with 

 bare hand. Rub thinly over the backs of the cows. 



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II. 



I. Ichneumon-fly. Natural size. 



II. Thalessa boring in an ash tree to deposit its eggs in the 

 burrow of a horntail larva, a wood borer. From photograph, 

 natural size. (After Davison.) 



III. Corn root aphis (Aphis maidiradicis ) , winged and wing- 

 less female. The two black processes at the rear are Cornicles. 

 (From Needham's "General Biology" bv permission The Comstock 

 Pub. Co.) 



