Technical Series, No. 20, Part II. 



U. S. DEPARTMENT OF AGRICULTURE. 



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 



TENTHREDINOIDEA. 



BY 



S. A. ROHWER, 



Agent and Expert. 



Issued Makch 4, 1911. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1911. 



