Form: The length of the stomach is 25~32mm and that of the back wings is 28~37mm. The male is bigger than the female. The female’s pattern on the edge of the back wings is more darker than that of the male. Both have two black stripes, one is on the chest and the other is on the stomach.
Other characters: The imago appears from July to October and they inhabit hill land or near the ponds. In autumn, they go down to waterside for distracted. They live in Korea, Japan and China. In Dongbaekdongsan(Gotzawal in Jeju), you can see them around the wetland “Meonmulkkak”.