LEHER OF TRANSMITTAL TO REVISED EDITION. 



U. S. Department of Agriculture, 



Division of Entomology, 



Washington, D. C\, May 24, 1899. 

 Sir: I have the honor to submit for publication the accompanying 

 slightly revised copy of Bulletin 'No. 4, \N'ew Series, of this division, 

 containing an account of the principal household insects of the United 

 States. It will be substantially a reprint of the first edition, which 

 was published nearly three years ago, a few comparatively unimportant 

 corrections having been made, and a few short paragraphs having been 

 added. Thus it is by no means a complete revision. 

 KespectfuUy, 



L. O. Howard, 



Entomologist, 

 Hon. James Wilson, 



Secretary of Agri-ctdture. 



