I have not used the usual common name "Giant Green Slantface" because there is is also a brown form of the same species.
Classification
from Australian Faunal Directory
Order Orthoptera - Grasshoppers, Crickets and Katydids, 1562 named species in Australia
Suborder Caelifera - Grasshoppers, 469 species in Australia
Family Acrididae - Grasshoppers and Locusts, 286 species in Australia
Genus Acrida
Species Acrida conica