SMITHSONIAN MISCELLANEOUS COLLECTIONS 

 VOLUME 125, NUMBER 1 



THE BLACK FLIES 



(DIPTERA, SIMULIIDAE) OF GUATEMALA 



AND THEIR ROLE AS VECTORS 



OF ONCHOCERCIASIS 



(With 44 Plates) 



By 



HERBERT T. DALMAT 



Laboratory of Tropical Diseases 

 National Institutes of Health 



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(Publication 4173) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



APRIL 5, 1955 



