Buffalo jumping with hoppers

Almost every tree or shrub that I looked at on Mt Buffalo had a hopper hiding on stems and leaves. They're tricky little critters to photograph because they duck and hide the minute a lens appears. Several of these were easy because they appear to have been caught in spider webs. The last one, a vision in white, had just emerged from its previous shell and was gathering strength.
I'd be grateful if anyone could identify any of these.