I found this grasshopper at the base of a paperbark tree in Purga Nature Reserve.
Its appearance is quite a cryptic and it blended in well with its surroundings.
During my attempts to identify it, I came across a photograph of a female Lumpy Beplessia in David Rentz's Grasshopper Country*, and I think this may well be the male of the same species.
*Rentz, David (1996). Grasshopper Country: The Abundant Orthopteroid Insects of Australia.
UNSW Press, plate 323 and p.189.