LETTER OF TRANSMITTAL. 
U.S. DEPARTMENT OF AGRICULTURE, 
BuREAU OF ENTOMOLOGY, 
Washington, D. C., November 29, 1911. 
Srr: I have the honor to transmit herewith a manuscript entitled 
“The Life History and Bionomics of Some North American Ticks,” 
prepared by Messrs. W. A. Hooker, F. C. Bishopp, and H. P. Wood, 
under the direction of Mr. W. D. Hunter, of this bureau. Ticks are 
of considerable importance in the United States in two respects. 
Two species are the sole agents in the transmission of certain impor- 
tant diseases. One of these diseases is the well-known splenetic fever 
of cattle and the other the Rocky Mountain spotted fever of human 
beings. The information contained in this manuscript will be of 
immediate value in connection with the eradication of the cattle tick 
and also of the form which transmits spotted fever. The remaining 
species treated in this manuscript are now of importance principally 
as parasites of domestic animals. In many localities they present 
serious problems to the farmer. Moreover, there is a possibility that 
some of the species not known at present to be carriers of diseases 
will eventually be found to be of importance in connection with 
disease transmission. For these reasons full information regarding 
the life history of the various species is in demand. 
The work upon which this bulletin is based has extended from 
1907 to the present time. The manuscript is intended to be a com- 
pendium of information regarding ticks which will remain of direct 
value for many years and make unnecessary the publication of spe- 
cial bulletins on some of the species treated. . 
I recommend that this manuscript be published as Bulletin No. 
106 of the Bureau of Entomology. 
Respectfully, L. O. Howarp, 
Entomologist and Chief of Bureau. 
Hon. JAMEs WILson, 
Secretary of Agriculture. 
