@ibaird @WendyEM @donhe I had a reply from Ian Mcmillan regarding this species; "Probably Cryptophasa chionodes, a sexually dimorphic species. Males are black and very much smaller. Graham Cocks found it in Townsville. Also known as Cryptophasa sp. ANIC74."
Both distribution maps indicate M. sarcolueca has somewhat of an Australia wide northerm distribution, but show no records from SE Australia. Until recently the stonghold of representation NatutreMapr has been predominently SE Australia, so personally, I'm not surprised such a distinctive moth has not showed up until now.
Cryptophasa russata certainly apparently has a far north tropical distribution in Far north Queensland and the Northern Territory, but most seem to be darker coloured. A minority of C. rubescens shown on the ALA have a terminal darker outter edge to the forewing, and its distribution apparently includes far North Qld., but that may not be a sufficiunt basis.
None of the pale form C. rubescens have the dark border like this. Could it be C. russata like this one https://bold-au.hobern.net/specimen.php?processid=ANIAB771-11
Definitely a tricky one. Some similar species have all black hindwings (e.g. Cryptophasa pultenae - males I think) others have part black hindwings but predominantly they are the inverse to this moth.