SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 

 Bulletin 66 



A MONOGRAPHIC REVISION OF THE TWISTED 



WINGED INSECTS COMPRISING THE 



ORDER STREPSIPTERA KIRBY 



W. DWIGHT PIERCE 



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





WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1909 



