The description of Ocrasa acerasta says the forewing is "entirely devoid of discal spot and transverse line", and the CNM sightings are sorted on that basis.
Ocrasa albidalis is listed in the following regions:
Canberra & Southern Tablelands | South Coast | Barwon South West | Greater Brisbane
Maps
Tidbinbilla Nature ReservePlaces
Melba, ACT