LETTER OF TRANSMITTAL. 



United States Department of Agricultube, 



Bureau of Biological Survey, 

 Washington, B. March 26, 1915, 

 Sm: I have the honor to transmit herewith, for publication as 

 North American Fauna No. 38, a review of the American moles 

 by Hartley H. T. Jackson, assistant biologist. Biological Survey. 

 Widely distributed throughout a large part of North America and 

 very numerous in many places, moles have in some localities proved 

 injurious to agriculture, though they are generally benej&cial through 

 their destruction of insects, which form much of their food. Their 

 economic status has not yet been fully determined but is now being 

 carefully investigated by this bureau, and for this work the present 

 paper will serve as a basis. 

 Respectfully, 



Kenry W. Henshaw, 

 Chief, Biological Survey. 



Hon. David F. Houston, 



Secretary of Agriculture. 



2 



ADDITIONAL COPIES 



OF THIS PUBLICATION MAY BE PROCITEED FEOM 

 THE SUPERINTENDENT OF DOCUMENTS 

 GOVERNMENT PRINTING OFFICE 

 ■WASHINGTON, D. C. 

 AT 



20 CENTS PER COPY 



V 



