Hyposmocoma ferruginea is a species of moth of the Cosmopterigidae family. It is endemic to Oahu, Hawaii. The type locality is Mount Olympus. The larvae feed on Cheirodendron species. The whitish larvae bore in dead twigs and branches. Swezey described the pupa as follows: 12 mm; pale reddish brown; antenna-sheaths, wing-sheaths and posterior leg-sheaths extend to near the apex of 5th abdominal segment; segments 4, 5 and 6 movable; cremaster blunt, with 6 or 8 hooked bristles.— Swezey, 1915:94