346 



NORTH AMERICAN DIPTERA 



Eiihydridae I. — 1, Lytogastcr; 2, Hydrina; 3, Ochtheroidea atra; 4, Parydra; 5, Brachy- 

 deutcra arg^ntata ; 6. Notiphila; 7, 8, Lipochaeta; 9, Allotrichoma ; 10, Discocerina; 11, 

 Ephydra; 12, Gastrops ; 13, Brachydeutera; 14, Lytogastcr; 15, Athyroglossa ; 16, Ochtheroidea; 

 17, Lytogastcr; 18, Hydrina; 19, Atissiella. 



