Technical Series, No. 26. 



U. S. DEPARTMENT OF AGRICULTURE, 



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



AMERICAN BLACK FLIES 

 OR BUFFALO GNATS. 



BY 



J. R. MALLOCIT, 



Entomological Assistant. 



Issued April (I, 1914. 



WASHINGTON: 

 GOVERNMENT TRINTING OFFICE. 



1914. 



