Not a derelict blue.....

....but a common grass blue. Had I been lucky enough to get her wings open you would see the prettiest little blue butterfly in the whole of South Australia.

I planted some of their host plant (hardenbergia) a few weeks ago, and it's already apparent that I have caterpillars.  You can't actually see them, as they come out to feed at night, and during the day they roll the leaf around themselves for protection.  I can see rolled leaves, but have yet to spot the 'pillar, even with a torch.