Looking again, the shape of the head capsule is unusual for Lasiocampidae. Several Erebidae subfamilies have caterpillars with this body arrangement, although I can't find a match e.g. http://lepidoptera.butterflyhouse.com.au/bole/bole-cats.html http://lepidoptera.butterflyhouse.com.au/calp/calp-cats.html http://lepidoptera.butterflyhouse.com.au/ereb/ereb-cats.html We will have to keep a lookout for a match.