THE TYPE-SPECIES OF THE NORTH AMERICAN 

 GENERA OF DIPTERA 



BY 



D. W. COQUILLETT 



Custudian of Diptera, U. S. National Museum 



No. 1719, —From the Proceedings of the United States National Museum, 

 Vol. 37, pages 499-647 



Published August 4, 1910 



Washington 



Government Printing Office 



1910 



