Males of this species can have a beautiful blue thorax, and the thoraxes of both males and females are somewhat spiny. At about the 3rd-instar, white spots appear on the thorax. The first hint of blue is also visible at this stage.
Females are large, and have spiked thoraxes.
They also have fascinating little protuberances on the tips of their abdomens. At maturity, both sexes are winged.