SMITHSONIAN MISCELLANEOUS COLLECTIONS. 



lk> 144 7 



MONOGRAPHS 



D I P T E R A 



NORTH AMERICA. 



PREPARED FOR THE SMITHSONIAN INSTITUTION 

 BY 



H. L O E W. 



PART I. 



\*\ 



EDITED, WITH ADDITIONS, 



K. OSTEN SAOKEN. 



WASHINGTON: 

 SMITHSONIAN INSTITUTION. 



APEIL, 1862. 



