Shield Bug

Notes:

Seen on the mulberry tree in our yard. I cannot tell whether this is a Gum Tree Shield Bug (Theseus modestus): http://www.qm.qld.gov.au/Find+out+about/... http://www.brisbaneinsects.com/brisbane_... or a Poecilometis sp.: http://www.biodiversitysnapshots.net.au/... http://www.brisbaneinsects.com/brisbane_... The Theseus modestus specimen in my 'Queensland Museum Wildlife Of Greater Brisbane' book doesn't look anything like the photo of the same species on the Queensland Museum website... but it looks exactly like the Poecilometis sp. spotting on the Brisbane Insects website. So I am completely confused and uncertain!