The Hieroglyphic Moth, Diphthera festiva, is a species of moth in the family Nolidae and is the only moth in its subfamily Diphtherinae. It is found in the tropical and subtropical areas of South America (as far south as Bolivia and Brazil), Central America, North America, and the Caribbean. In North America, the species has a south-eastern distribution from South Carolina west to Texas along the Gulf Coast. Strays have been recorded as far north as Michigan and Missouri. The wingspan is 37–48 mm (1.5–1.9 in). This species is occasionally considered a pest on soybeans.