It's the length of wing buds that's best indicator of which instar you have but comparisons are hard to come by. Leuba's spotting is an earlier instar to Martins. And yours looks maybe the same stage as Leuba's... but yours has some yellow on the pronotum which hers doesn't. That's why I said it might be a close cousin... same genus maybe. Pentatomidae might be safest until expert comment comes in.
Lovely little stinkbug nymph Barbara. Can't tell exactly which one... they all change so much as the grow. Very similar here http://www.whatsthatbug.com/2008/12/13/unknown-immature-stink-bugs-from-australia/
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