LETTER OF TRANSMITTAL. 
U. S. Department of Agriculture, 
Bureau of Entomology, 
Washington, D. C, November 15, 1912. 
Sir: I have the honor to transmit herewith, and to recommend for 
publication as Bulletin No. 117 of the Bureau of Entomology, a 
manuscript entitled "The Red Spider on Hops in the Sacramento 
Valley of California," by William B. Parker, an entomological assistant 
in this bureau. 
This manuscript deals with a pest the study of which has been 
hitherto largely neglected and which of recent years has attracted 
much attention from an economic standpoint, on account of immense 
losses to growers of hops and other crops in the Pacific coast region 
and elsewhere. 
Mr. Parker's studies, as outlined in this paper, have added con- 
siderably to the knowledge of the habits of this pest and have shown 
methods by which it may be economically controlled. 
Respectfully, 
L. O. Howard, 
Entomologist and Chief of Bureau. 
Hon. James Wilson, 
Secretary of Agriculture. 
a 
