P. protecta is golden yellow incl. palps, head and 'neck', small dark marks on 'shoulders' , dark band along costa 2/3 of length to apex, narrow line diagonally into the wing from near apex, this can vary in intensity and may be broken https://bold-au.hobern.net/specimens.php?taxid=408813 https://inaturalist.ala.org.au/observations?verifiable=true&taxon_id=785542&place_id=6744&preferred_place_id=6744
P. hypocausta - the BOLD (hobern) and 'Research Grade' specimens on iNat have a dark thorax. In the discussion on one of these iNat specimens ( https://inaturalist.ala.org.au/observations/140047502 ) Peter McQuillan says " A good match for Meyrick's original description. The type locality is Adelaide. The images for hypocausta in the Atlas of Living Australia are not this species. https://archive.org/details/proceedingsoflin0108linn/page/481/mode/1up?view=theater&q=hypocausta" This description says " Thorax deep yellow, (my caps) ANTERIOR HALF, OR SOMETIMES WHOLLY, SUFFUSED WITH DARK FUSCOUS." (my caps) Sadly P. protecta is not described in this archive document.