H. coryphoea I agree it looks quite like H. sinuata forewings, although most of them have distinct black markings on hindwings. However this appears to be a coastal species. I thtink this must be H. coryphoea which has a more inland distribution and has less black on the hindwings. The forewing pattern can fit this sp too. https://bold-au.hobern.net/specimens.php?taxid=321461 https://inaturalist.ala.org.au/observations?place_id=6744&preferred_place_id=6744&quality_grade=research&taxon_id=424802