158 



NORTH AMERICAN DIPTERA 



RhagionidiB I. — 1, Vermileo; 2. Rhagio punctipennis; 3. Vermileo; 4, Syinphoromyia 

 pleuralis; 5, Ptiolina majuscula; 6, Chrysopilus cjuadratus; 7, Dialysis elongata. 



