SummarySkins of ibises attributed to forms within the Sacred IbisThreskiornis aethiopicuscomplex,sensuHolyoak (1970) were examined for variation in 12 morphological characters and measured for four other characters. This investigation revealed significant variation within these characters and that several forms of the ibis showed distinct and diagnostic suites of characters. The study concludes that three species should be recognisedviz. T. aethiopicus, T. melanocephalusandT. moluccuscomprising a superspecies complex. It was also concluded thatT. strictipennisis synonymous withT. moluccusand thatT. pygmaeusis a distinct and dwarfed form ofT. moluccus.The formsT. abbottiandT. bernieriare very similar to one another and are most closely related toT. aethiopicus. T. melanocephalusis distinct from other members of the complex.