406 



NORTH AMERICAN DIPTERA 



28 \ 



Metopiidae II. — 13, Hemilucilia; 14, Pollenia rudis ; 15, Mesembrinella ; 16, Taxigramma; 

 17, Senotainia; 18, Opsidea; 19, Hilarella; 20, Metopia leucocephala, c"" t -1, 22, Pachyoph- 

 thalmus; 23, Pollenia rudis; 24, Camptopyga; 25, Sarcophagra; 26, Raviniopsis; 27, Senotainia; 

 28, Opsodexia; 29, Camptopyga; 30, Phytodes heiculus. 



