Milionia delicatula, commonly known as the blue day flying moth, is a species of geometer moth in the family Geometridae.[1] It is primarily found in the forests of tropical regions, particularly in parts of Southeast Asia, including Malaysia, Indonesia, Thailand, Vietnam, and the Philippines.
Its wings feature streaks of blue coming from the base. The forewings displaying a thick black border and a wide strip of mint green near the middle. The hindwings are dark blue, accented by a thin, iridescent light-blue line. The wingspan typically ranges from about .