Betasyrphus serarius (Wiedemann)  

Betasyrphus species have face densely gray pollinose; eye densely and uniformely pilose; scutum black, with at most a poorly defined dull yellow pollinose lateral vitta; katepisternal pile patches separated posteriorly; abdomen margined; metasternum bare; metaepisternum bare; abdominal maculae yellow or grayish, always very densely pollinose.