Because of the singular dexterity with which, when lying on its back, it throws itself into the air, and falls on its feet.
Because it is emitted from two protuberant, transparent, or windowed tubercles attached to its thorax, besides which there are two luminous spots beneath the elytra, only visible, of course, when it is on wing, and they are elevated: it then appears studded with four rich and vivid gems of a golden, blue lustre. In fact, the whole body seems a flood of pure light. In the West Indies, the natives employ these living fires to give light in managing their household concerns. In travelling, they are wont to attach one to each toe; and it is stated that in fishing and hunting they require no other illumination. - J. Murray.