152 



NORTH AMERICAN DIPTERA 



Tabanida? 11.-14, Dichelacera analis; 15, Scione auiulans; 16, Silvius pollmosus : 17, 

 Lepiselaga crassipes ; 18, Diachlorus ferrugatus : 19, Chrysops melsna ; 20, Scione aurulans; 

 •>1 Lepisclaga crassipes; 22, Scaptia; 23. Stibasoma theotama panamensis ; 24 Dichelacera 

 analis: 25, Esenbeckia prasiniventris ; 26, Silvius gigantulus ; 27, Tabanus albocirculus. 



