Technical Series, No. 20, Part I. 



U. S. DEPARTMENT OF AGRICULTURE, 



BTJRE^XJ OF p:;Na^0]V10L0<3-Y. 



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



TECHNICAL PAPERS ON MISCELLANEOUS 

 FOIIEST INSECTS. 



I. CONTRIBUTIONS TOWARD A MONOGRAPH 

 OF THE BARK-WEEVILS OF THE 

 GENUS PISSODES. . 



A. D. HOPKINS, Ph. D., 



In Charge of Fared lnm:l Investigations. 



Issued January 7, 1911. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1911. 



