The posterior wings are dark brown with two black spots in the middle, followed by some irregular transverse dark brown bands.

The posterior wings have a tail 3/4 inch long in both sexes.

The name refers to the dark, distinct venation of the posterior wings.

The anterior wings are short, in the form of elytra, while the posterior wings fold up beneath them.

The posterior wings have three black cross bands.

The last floor of the posterior wing is marked by a succession of rooms and the chapel.

This is also on the posterior wings and can even cover almost all of the hindwings and forewings .

Trilobite antennae pass through notches between the anterior and posterior wings, then forward.

The posterior wings are greyish in the male, in the female nearly as above, but paler.