Demodex melanopteri sp. n. from the Meibomian glands of the neotropical bat Eptesicus melanopterus is described and figured in detail. Morphology of immature stages is compared to other species of genus Demodex which are also inhabitants of the Meibomian complex. This new demodicid apparently relies upon the peculiar shape and flexibility of the ovum and the well developed, heavily clawed larval, nymhal and adult legs for maintenance of position in the Meibomian complex. Operculate ova and !arval egg teeth probably represent modifications for rapid eclosion of the larvae; such could be of survival value in this unusual habitat