Hoppers on my grevillea

Yesterday I saw these little hoppers (treehoppers?) hopping around the foliage of a grevillea in my garden. With the help of Tony of Tasmania the ID has been narrowed down to the Membracidae family and probably Terentius sp. They haven't actually been recorded in Victoria on any of the references we've looked at but the descriptions fit.

This morning I went out to have another look, and found instars - the molt shells - as well as a few more of the hoppers.