Technical Series, No. 26. 



U. S. DEPARTMENT OF AGRICULTURE, 



BXJREATJ OW ENTOIMOLO&Y. 



L. 0. HOWARD, Entomologist and Chief of Bureau. 



AMERICA]^ BLACK FLIES 

 OR BUFFALO GNATS. 



BY 



J. R. IVMLLOCH, 



Entomological Assistant. 



Issued April 6, 1914. 



WASUINGTON: 



GOVERNMENT PRINTING OFFICE. 



1914. 



