I believe this is more likely to be P. casuarinae, the common local species. Some of its specimens have the white dot. P. menephron is a northern species (but vagrants are possible)
OK, I notice according to BOLD Systems 4,P . menephron has an Asian and N. Queensland distribution, whereas P. causuarinae extends from eastern Victoria right to Cape York. I'm happy to go with P. casuarinae if the presence of the white spot is not definitive for P. menephron.