PREFATORY NOTE. 



The accompanying preliminary report of my investigations of insects 

 injurious to forests in California, Oregon, Washington, and Idaho is 

 made in accordance with the authorization of the Secretary of Agri- 

 culture, dated March 30, and the letter of the Entomologist, dated 

 April 11, 1899. 



Before proceeding further, I wish to express grateful acknowledg- 

 ments to all those who have in any way assisted me in this work^ among 

 whom the following deserve special mention: Messrs. Pergande and 

 Busck, for the excellent care of the breeding material sent in from the 

 field; Mr. Hine, for the excellent and rapid manner in which the reared 

 and collected insects were mounted; Mr. Clifton, for assistance along- 

 other lines, and especially Mr. Schwarz, who devoted much time out- 

 side of office hours in helping me to make the preliminary investigation 

 and classification of alcoholic material and the determination of the 

 Coleoptera. 



In addition to the above I should mention my obligations to United 

 States Senator McBride for letters of introduction to persons in Oregon 

 who gave me valuable information. 



Among the entomologists and other members of the staff or faculty 

 of the several universities and experiment stations visited whose hos- 

 pitality and interest in furthering the objects of the journey deserve 

 special mention were Dr. Hilgard and Professors Woodward and 

 Davy, of the University and Experiment Station at Berkeley, Cal. ; 

 Professors Cordley and Lake, of the Agricultural College and Experi- 

 ment Station at Corvallis, Oreg. ; Professor Kincaid, of the State Uni- 

 versity of Washington; Professor Piper, of the Agricultural College 

 of Washington, and Prof essors Aldrich and Henderson, of the Univer- 

 sitv of Idaho. 



A. D. H. 



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