DRAGONFLIES OF THE MISSISSIPPI VALLEY 

 COLLECTED DURING THE PEARL MUSSEL 

 INVESTIGATIONS ON THE MISSISSIPPI 

 RIVER, JULY AND AUGUST, 1907 



BY 



CHARLES BRANCH WILSON 



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 



