Biota of Freshwater Ecosystems 



Identification Manual No. 6 



AQUATIC DRYOPOID BEETLES (COLEOPTERA) OF THE UNITED STATES 



by 



Harley P. Brown 

 Department of Zoology ] 

 The University of Oklahoma 

 730 Van Vleet Oval, Room 222 

 Norman, Oklahoma 73069 





;.^Y 



LIBRARY 



WOODS HOLE, [ViASS. 

 W, H. 0. I. 



for the 

 ENVIRONMENTAL PROTECTION AGENCY 



Project # 18050 ELD 

 Contract # 14-12-894 



April 1972 



For sale by the Superintendent of Documents, U.S. Government Printing Office 



Washington, D.C. 20402 - Price $2.50 



Stock Number 5501-0370 



