Technical Series No. 17. 



U. S. DEPARTMENT OF AGRICULTURE, 



BTJRK-A.TJ OW ENTOMIOLOG-Y. 



L. O. HOWARD. Entomologist and Chief of Bureau. 



CONTEIBUTIONS TOWAED A MONOGKAPH 

 OF THE SCOLYTID BEETLES. 



CONTENTS AND INDEX. 



Issued February ]9, 1921. 



WASHINGTON: 



OOVKRNMENT PRINTING OFFICE, 



1921. 



