Tagiades nestus, the Papuan snow flat or Nestus flat, is a butterfly of the Hesperiidae family. It is found on the Australian islands in the Torres Strait and in New Guinea. Its wingspan is about 40 mm. Its larvae feed on Dioscorea species. The caterpillars nibble pieces out of the margins of the leaves leaving characteristic scalloped edges to the foliage. They live in shelters composed of pairs of such leaves joined with silk.