SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 

 Bulletin 116 



THE DIPTEROUS GEHUS ■^0"™°™^ 

 LATREILLE IN NORTH AMERICA 



BY 



M. C. VAN DUZEE, F. R- COLE 



AND 



J. M. ALDRICH 





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.<s<^ yoRB 





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WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1921 



