

SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 

 Bulletin 66 



A MONOGRAPHIC REVISION OF THE TWISTED 



WINGED. INSECTS COMPRISING THE 



ORDER STREPSIPTERA KIRBY 



BY 



W. DWIGHT PIERCE 



Of the Bureau of Entomology, U. S. Department of Agriculture 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1909 



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