Illyria major, also known as the desert rattler, is a species of cicada in the true cicada family. It is endemic to Australia.
The forewing length is 31âÂÂ37 mm.
The species occurs in arid regions of northern Western Australia from Shark Bay, eastwards through the central Northern Territory to Mount Isa in north-western Queensland. The habitat includes open Acacia shrubland.
Adults cling to the stems of shrubs and small trees, uttering loud, penetrating, rattling calls.