10 spp. in our area, 17 total(1)
eastern spp.: D. elongata lacks the M3 cell; the other two can be distinguished based on abdominal markings: broad bands across most tergites in D. fasciventris, smaller spots in D. rufithorax
NA & Eurasia; in our area, 6 spp. in the west (esp. CA) & 4 in the east(1)
Male eyes holoptic, female eyes separate.