Lepidoptera: Hepialidae
Abantiades hyalinatus
Ghost Moths appear and fly on only one or two nights each year, mostly in Autumn after rain, but also in lesser numbers in Spring*.
Although they live as larvae for years, boring their way through tree trunks, these moths only live as adults for a day. They cannot eat or drink and their sole purpose, as adults, is to propagate.
*Zborowski, Paul and Edwards, Ted (2007). A Guide to Australian Moths. CSIRO Publishing, p.40.