Technical Series, No. 20, Part III. 



U. S. DEPARTMENT OF AGRICULTURE, 



BXJRKAXJ OF ENTOlvrOLOG^^". 



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 LYGTIDil OF THE 



UNITED STATES AND EUROPE. 



E. J. KRAUS, 



Expert Preparator, Forest Insect Investigations. 



APPENDIX. 



NOTES ON HABITS AND DISTRIBUTION WITH 

 LIST OF DESCRIBED SPECIES. 



A. D. HOPKINS, Ph. D., 



In Charge of Forest Insect Investigations. 



Issued May 5, 1911. 



WASHINGTON 



GOVERNMENT TRINTING OFFICE 



1911 



