LETTER OF 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. 
