302 



NORTH AMERICAN DIPTERA 



Calobatidje I.—l. Parasphen ruficauda : 2, Ptilosphen ; 3, Rainieria; 4, Seipopus di versus; 

 5. Grallipeza; 6, Cardiacephala; 7. Grallomya; 8. Hoplocheiloma; 9. Seipopus; 10. Parasphen; 

 11, Calobata univittata; 12, Taeniapteia ; 13. Cardiacephala. 



