Protohermes grandis (Thunberg, 1781) is a colorful species of dobsolfly, belong to Megaloptera order. It is an aquatic insect that larvae live in the water, mainly clear streams. The mature with wings is attracted to the light. They are quite common species, found in Indochina, China, Taiwan and Japan.
A individual of Protohermes grandis (Thunberg, 1781) on the light trap sheet, Mau Son Mountain, elevation about 1500m