Their flattened, dark brown or black body is often marked with orange or yellow. Members of the Coleoptera family Elateridae are also called fireflies. The female waits and flashes at flying males. The males flash back and try to find the right species females. The temporal and spatial pattern of the light flashes confer species specificity - usually.
Biology is a case in exceptions.
There is one species of firefly whose females flash in many different ways to attract other species males. Only light in the visible spectrum is emitted. A single blip of light is repeated at regular intervals every second by P. frontalis , every two seconds by P. hebes , every four seconds by P. cinctopennis . A double blip is the visible signature of P. fairchildi males, which repeat it every 5.5 seconds. A streak of light is the sign of P. caerulucens , which turns on his luminous organ every four seconds and lets it shine a full second before turning it off again.