We describe a new species of Austrochaperina from the Bewani Mountains of northwestern Papua New Guinea. The new species is a member of Zweifel's (2000) “Large” group of Austrochaperina closely related to A. hooglandi, from which it differs in size, color pattern, call parameters, and ecology. It differs from its other 23 congeners in a variety of morphological and color pattern attributes, and in advertisement call.