Agonoxena argaula, or the coconut flat moth, is a moth of the family Agonoxenidae. It was first described by Edward Meyrick in 1921 from Fiji and is also known also from Guam, the New Hebrides, Tonga, Samoa, Ellice, Wallis, Futuna, and the Palmyra Atoll. It was first recorded in Hawaii in 1949. It is artificially spread by commerce. It is the largest known species of the genus. Adults are yellowish brown with narrow pointed wings. The male moth bears a linear white mark on the forewings. There is much variation in the color and color pattern of the adults.