Adults are butterfly-like: They fly during the day, drink from flowers and even have antennae that are thickened at the tips. The overall wing color is black. The forewings have two pale yellow spots; the hindwings have two white spots. The body is mostly black. The front and middle pairs of legs have patches of bright orange hairs. The flight is fast and darting. The black and white pattern creates a flickering effect like a strobe light.
Larvae are whitish lavender, with each segment having several narrow, black transverse lines and one wide orange band. There are small black tubercles on the body, and white spots in the abdominal area. The head is orange.