Ceryx diptera is a moth of the Arctiidae family. It was described by Fabricius in 1775. It is found in southern India and Sri Lanka. In male, the body is black. Frons, collar and tegulae are yellow. Fore wings with a sub-basal, two medial, one sub-apical and two sub-marginal hyaline spots. Hind wings with a sub-basal joined to a sub-marginal spot. tarsi black. Female is similar to male, but differ with the abdomen dilated and with a tuft of ochreous hairs.