DRAGONFLIES OF THE MISSISSIPPI VALLEY 

 COLLECTED DURING THE PEARL MUSSEL 

 INVESTIGATIONS ON THE MISSISSIPPI 

 RIVER, JULY AND AUGUST, 1907 



BY 



CHARLES BRANCH WILSON 



Department of Biology, State Normal School, Westfield, Massachusetts 



No. 1692. — From the Proceedings of the United States National Museum, 

 Vol. XXXVI, pages 653-671 



Published June 19, 1909 



Washington 

 Government Printing Office 



1909 



