Woodlands Historic Park True Bugs

Acacia Stink Bug (Alcaeus varicornis) at Woodlands Historic Park
Acacia Stink Bug on Black Wattle, late April. About 15mm long.
Acacia Stink Bug nymph at Woodlands Historic Park
Acacia Stink Bug nymph, late April.

Classification

from Australian Faunal Directory

Order Hemiptera - bugs, hoppers and scale insects
Suborder Heteroptera - true bugs, 2806 named species in Australia
Superfamily PENTATOMOIDEA - Shield Bugs, 572 named species in Australia
Family PENTATOMIDAE - Stink bugs, 364 species in Australia
Genus Alcaeus
Species Alcaeus varicornis