A large species with three tails and large hind wings. The sub-imago (immature adult) has grey wings, with a yellowish green tinge and heavy venation. The body is creamy yellow with distinctive brown markings on the body segments. The tails are dark grey black and the legs are a creamy olive colour with black markings. In general, the colours of the wings, tails and legs are darker, and the body paler in the male. The imago (fully mature adult) has transparent wings, which have heavy brown venation and several dark patches. The body is creamy white with the last three segments brownish. The tails are extremely long and almost black in colour.