LETTER OE TRANSMITTAL. 



U. S. Department of Agriculture, 



Bureau of Entomology, 

 Washington, D. C, December 21, 1912. 



Sir: I have the honor to transmit herewith the manuscript of a 

 paper entitled "The hop aphis in the Pacific region," prepared with 

 admirable thoroughness by Mr. William B. Parker, Entomological 

 Assistant. The topic is one which has engaged Mr. Parker's atten- 

 tion for two seasons, 1911 and 1912. The work covers investigation 

 in the States of Washington, Oregon, and California. The principal 

 work was conducted in California, but the author has had consider- 

 able experience with hop insects, including the hop aphis, in British 

 Columbia. The principal insect pests of the hop have not, until 

 recent years, had adequate treatment in publications on economic 

 entomology, and this paper should therefore prove of great value to 

 hop growers. 



I recommend its publication as Bulletin No. Ill of this bureau. 

 Respectfully, 



L. O. Howard, 

 Entomologist and Chief of Bureau. 

 Hon. James Wilson, 



Secretary of Agriculture. 



