352 



NORTH AMERICAN DIPTERA 



Ephydridae IV. — 55, Eph.vdra milbrae; 56, Discocerina obscurella; 57, Paralimna lexana; 

 58, Leptopsilopa nigra; 59, Rhysophora aspersa; 60, Parydra; 61, Psilopa; 62, Clasiopella; 

 63, Ilythea; 64, Stenochthera; 65, Ochtheroidea centralis; 66, Leptopsilopa nigrimana; 67, Para- 

 tissa pollinosa; 68, Cerometopum mosilloides; 69, Notiphila erythrocera, middle leg. 



