How to identify it?
Nymph
Nymph antennae are yellow. A pair of red compound eyes. Thorax black. Abdomen flat, flower-shaped, blue, metallic-lustrous. 3 pairs of legs, tibia with unique black lobate structure.
Adult
Fully blackish-brown. Head small. Tergut with a sharp protuberance on each end. Lateral margin of abdomen flat, extending outwards beyond wings. A pair of 4-somites antennae, apical flagellomeres orange. The first half of forewing leathery, second half membranous, membranous part lighter-colored. Pleopod tibia with a unique lobate structure.
Photo By Bruce Marlin , used under CC-BY-3.0 /Cropped and compressed from original