XIV THE SCOLYTID BEETLES. 



and as aids in the preparation of teclinical and economic contribu- 

 tions to the monograph. 



I recommend the publication of this paper as Part I of Technical 

 Series, No. 17, of the Bureau of Entomology. 

 Respectfully, 



L. O. Howard, 

 Chief of Bureau. 

 Hon. James Wilson, 



Secretary of Agriculture, 



