

THE TYPE-SPECIES OF THE NORTH AMERICAN 

 GENERA OF DIPTERA 



BY 



D. W. COQUILLETT 



Custodian of Diptcra, 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 



