Tarsocera cassina, the sand-dune widow, is a butterfly of the family Nymphalidae.

It is found in South Africa in the Western Cape along the coast from Lambert's Bay to Bredasdorp.

Adults are on wing from September/October to November.

There is one generation per year[2] The larvae feed on various Poaceae species, including Lolium species and Brachypodium distachyum.

This Satyrini article is a stub.