This species has been seen only once in Woodlands Historic Park, and was not on it's food plant which is Black Wattle.
Classification
from Australian Faunal Directory
Order Hemiptera - bugs, hoppers and scale insects
Suborder Auchenorrhyncha - Cicadas, Hoppers, and Spittlebugs
Super-family Membracoidea - Leaf-hoppers and Tree-hoppers, 860 species in Australia
Family Membracidae - Horned Treehoppers, 85 named species in Australia
Genus Acanthuchus
Species Acanthuchus trispinifer