In Lepidoptera wing reduction is usually restricted to the females. We report a rare case of male brachyptery in the genus Xenomigia Warren, 1906 (Notodontidae: Dioptinae) from the high Andes of Venezuela. At the same time this is the first case of wing reduction in the family Notodontidae (Noctuoidea). The new species Xenomigia brachyptera sp. n. is described and the adult, male genitalia and other structures of the adult morphology are illustrated. Some aspects of wing reduction in Lepidoptera are discussed.