This genus is noted for the striking difference in appearance between males and females. In males, the abdomens become bluish-white with age.
Females have lateral, yellow spots on their abdomens.
The chocolate-black crossband located toward the wing tips is uniform in color, and a brown spot is located at each wing base. Beyond the brown basal spots in the hind wings, the males usually acquire a patch of white. In addition, the females of this species have brown wing tips. Adults are found hovering over the water surface and perching on shore. The nymphs have a dark brown coloration.