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Holcostethus strictus
You are not intrusive, of course you should correct whenever you think is wrong, anyway I am not an expert so I had my doubts too. Btw I really don't like green stink bugs so I'm relieved now that is not it ;)
Nezara viridula, I believe- one of the many morphs
http://en.wikipedia.org/wiki/Nezara_viri...