There is a particular venation pattern on the forewings (the double-looped anal veins).

Their anal veins are 1b and 1c like on the forewings; they lack vein 1a but also have the tubular vein 1c.

The anal vein is vestigial, its similar to species in the families Isostictidae and Protoneuridae.

The male emits a pleasant scent from the fringe of white hairs along the anal vein of the hind wing.

As there are several anal veins, they are called A1, A2, and so on.

The hindwings are dark brown with a white patch on the anterior margin and white hair pencils along the anal veins.

In addition there are two anal veins, of which the second, also called the axillary, separates the anal region from the alula.

- only two anal veins 1A and 2A are present, 2A is not distinctive in some species.

The third axillary usually articulates with the posterior notal process and with a group of anal veins.

The hindwings have only 8 veins, with the anal veins vestigal or absent.