This is a fairly large weevil, with the biggest being about 25mm in length. It is easily recognised by its distinctive pale blue-green and black speckled body. Like all weevils, it has a long snout. The species can be found in Queensland, New South Wales, Victoria and South Australia. It is known to feed on several species of wattle. Adult weevils eat twigs and leaves, while the larvae bore into the roots. They are slow-moving creatures and may feign death when disturbed.

The Botany Bay Diamond Weevil was one of the first Australian insects to be named. It was described from material collected by the naturalist Joseph Banks, who was on board the HMS Endeavour with Captain Cook at Botany Bay in 1770.