This species does not "officially" have a common name. I have called it the Geranium Stilt Bug because it is only found on plants in the Geranium family, including Austral Stork's-bill as shown here. Strangely enough it is a predator so it does not actually feed on the host plant, but rather on other insect species which feed on the host plant, such as Aphids.
Classification
from Australian Faunal Directory
Order Hemiptera - bugs, hoppers and scale insects
Suborder Heteroptera - true bugs, 2806 named species in Australia
Family Berytidae - Stilt Bugs, 8 named species in Australia
Genus Chinoneides
Species Chinoneides tasmaniensis