Diplacodes haematodes (Scarlet Percher)
This is recorded from all mainland states/territories of Australia and is also known from Indonesia and Papua New Guinea, together with various other Pacific Islands.
This critter is bright red, the male, anyway, with no discernible markings. In this way it is reminiscent of the European Crocothemis erythraea (Broad Scarlet/Scarlet Darter) but has no blue underside to the eye. The last pic here seems to show very faint yellow wing patches but some appear more discernible. We found it at the waterfalls running through Beechworth Historic Park.