Wingspan: 75 to 85 mm
The caterpillars of this butterfly feed on wattles and other legumes. According to Field in "Butterflies: Identification and life history" it has regularly been seen in Victoria since 1974 but is not permanently established, and most specimens have been seen in late summer or Autumn unlike the above individual. The photo is of a male waiting for a mate at the summit of Gellibrand Hill. There was still a battle-scarred male there in mid February, possibly the same one - I hope he had some success in the meantime!
Classification
from Australian Faunal Directory
Order Lepidoptera - Moths and Butterflies, 10855 named species in Australia
Family NYMPHALIDAE - Browns and Admirals, 98 species in Australia
Genus Charaxes (3 Species in Australia)
Species Charaxes sempronius sempronius