How to identify it?
Nymph
Nymph shiny red. Protergum trapezoid, with a pair of symmetrical rectangular black spots. Wing pad black. Abdomen red, with symmetrical black spots.
Adult
Overall black. A pair of antennae and a pair of round compound eyes on the head. Head deltoid, with a red Y-shaped mark. Protergum and wings are symmetrically red-patterned. 3 pairs of black legs.