The bats of Pemba are poorly known, but recent surveys have provided material to critically examine the species that occur on this island, roughly 50 km off the coast of Tanzania. A new species of Mops (Molossidae) is described from Pemba and aspects of its distinguishing characteristics from other molossids and habitat are discussed. This new species differs from the type of M. brachypterus by lacking basisphenoid pits. The form brachypterus needs critical review.