Pseudothyris sepulchralis, the mournful thyris, is a species of day-flying[1] moth in the family Thyrididae and can be found throughout North America.

The adults are rarely found on flowering plants for feeding.

[1] As an adult, its wingspan is around 15–23 millimetres (0.59–0.91 in) and its body is black with white spots and marks.

[4] The larva cuts an almost perfect circle into a leaf, before rolling itself in it, creating a pouch shaped cocoon and hibernating in it until the following year.

This article about a taxon in the moth family Thyrididae is a stub.