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 Healtii 



(Publication 4173) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



APRIL 5, 1955 



