Technical Series, No. 20, Part I. 



U. S. DEPARTMENT OF AGRICULTURE. 



BXJRE^^XJ OF ENTOMOI.O&'i'. 



L. 0. HOWARD, Entomologist and Chief of Bureau. 



TECHNICAL PAPERS ON MISCELLANEOUS 

 FOREST INSECTS. 



I. CONTRIBUTIONS TOWARD A MONOGRAPH 



OF THE BARK-WEEVILS OF THE 



GENUS PISSODES. 



A. D. HOPKINS, Ph. D., 



In CJiarye of Forest Insect Investigations. 



Issued January 7, 1911. 



^<i^%a/ (Vlasevi^^"'' 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1911. 



