^^v/^ -/ 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— BULLETIN No. 68, Part I (Revised). 



L. O. HOWARD, Entomologist and Chief of Bureau. 



PAPERS ON DECIDUOUS FRUIT INSECTS 

 AND INSECTICIDES. 



THE PEAR THRTPS. 



DUDLEY AIOULTO]:^, 



Engaged in Deciduoui^ Frmi Insect Investigations. 



IssiKD September 20, 1909. 



•^^ 



WASHINGTON: 



GOVERNMENT PRINTING (^KFICK. 



19 OH. 



X08Z^S 



