A REVISION OF THE SOUTH AMERICAN DIPTER- 

 OUS INSECTS OF THE FAMILY 

 PTYCHOPTERID.E 



CHARLES P. ALEXANDER 



Of the Entomological Laboratory of Cornell University, Ithaca, New York 



No. 19S3.— From the Proceedings of the United States National Museum, 

 Vol.44, pages 331-335 



Published February 20, 1913 



Washington 



Government Printing Office 



1913 



