LETTER OF TRANSMITTAL. 
U.S. DEPARTMENT OF AGRICULTURE, 
Bureau oF ENTOMOLOGY, 
Washington, D. C., May 23, 1911. 
Sir: I have the honor to transmit for publication a paper dealing 
with the subject of the house fly or typhoid fly. Previous publica- 
tions of this department concerning this insect. have been in circular 
form, but it is desired to make this information more widely avail- 
able through the medium of a Farmers’ Bulletin. With this inten- 
tion this manuscript has been prepared, being modified and amplified 
from Circular No. 71 of this bureau, and I respectfully recommend 
its publication as a Farmers’ Bulletin. 
Respectfully, L. O. Howarp, 
Entomologist and Chief of Bureau. 
Hon. JAMES WILSON, 
Secretary of Agriculture. 
459 
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