Christmas Beetles (members of the genus Anoplognathus) occur all over Australia in summer. They can be common at times and you can often see windrows of them in car parks or in brightly lit shopping centres. Most species are Anoplognathus.
Anoplgnathus punctulatus-the most common species in the rainforest
Anoplognathus smaragdina (rare blue morph)
I have reported on these beetles several times. Merely use the "Search" function and insert the genus name and you see them all.(reddish morph)
Anoploganthus aureus (Australian Gold Beetle)- a real gem
Calloodes grayianus (Gray's Christmas Beetle)
Larger than most Anoplognathus and seemingly less common