Mystery Stink Bugs - Ocirrhoe sp.?

As far as things to drive you completely buggy go, trying to ID shield bugs is proving difficult to beat. Mostly because their isn't that much variety in their shape, and the problem only becomes worse when you're trying to ID them from Nymphs.

 

Very similar to Ocirrhoe unimaculata, but lacking the pale dot that species has in the middle of the back. Might just be a colour form.

 

My yard, Perth, Western Australia

Done