206 



NORTH AMERICAN DIPTERA 



Empidse I. — 1, Hybos ; 2, Toreus; 3, Hesperetnpis; 4, Oreogeton; 5, Prorates (Bomby- 

 liidse) ; 6, Heleodromia ; 7, Ocydromia; 8, Coloboneura; 9, Toreus, antenna; 10, Prorates 

 (Bombyliidse) ; 11, Hesperempis, 12; Mythicomyia (Bombyliidae). 



