272 



NORTH AMERICAN DIPTERA 



"^i-.; i 



Otitidaj I— 1, Macrostenomyia; 2. Senopterina; 3, Delphinia picta; 4. Idana; o. Rivellia: 

 6, Tetanops; 7, Pseudotephritis ; 8. PsairoptercUa maciocephala : 9, Chatopsis; 10. Coilometopia; 

 11. Pterocalla; 12, Melieria; 13. Eumetopiclla ; 14. Richardia. 



