6 dd^h i 



Technical Series, No. 20, Part III. 



U. S. DEPARTMENT OF AGRICULTURE, 



BXJREAXJ OF ENTOlVrOLO&Y. 



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



TECHNICAL PAPERS ON MISCELLANEOUS 

 FOREST INSECTS. 



III. A REVISION OF THE POWDER-POST BEETLES 



OF THE FAMILY LYCTIDil OF THE 



UNITED STATES AND EUROPE. 



BY 



E. J. KRAUS, 



Expert Preparator, Forest Insect Investigations. 



APPENDIX. 



NOTES ON HABITS AND DISTRIBUTION WITH 

 LIST OF DESCRIBED SPECIES. ^ 



BY 



A. D. HOPKINS, Ph. D., 



In Charge of Forest Insect Investigations. 



Issued May 5, 1911, 



MAY 12191.1 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1911 



