IV LETTER OF TRANSMITTAL. 



interpretation, and recognition of generic and specific characters, on 

 which depends the future success of economic work on the scolytid 

 beetles, and as aids in the preparation of technical and economic 

 contributions 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, 



Ohief of Bureau. 

 Hon. James Wilson, 



Secretary of Agriculture. 



