Technical Series, No. 20, Part II. ' ' 



U. S. DEPARTMENT OF AGRICULTURE, 



BXJRE^TJ OK' TClSrTOM:OIL.OG^Y. 



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



TECHNICAL PAPERS ON MISCELLANEOUS 

 .FOREST INSECTS. 



II. THE GENOTYPES OF THE SAWFLIES AND 



WOODWASPS, OR THE SUPERFAMILY 



TENTHKEDINOIDEA. 



S. A. ROHWER, 



Agent and Expert. 



Issued M.\rch 4, 1911. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1911. 



