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Scoliidae, most probably a Radumeris sp.. The one from the link, Radumeris radula looks (almost) identical, but was taken in Western Australia. There is also a Radumeris tasmaniensis, also from Western Australia:
http://www.flickr.com/photos/31031835@N0....
Please, verify and check the different location.
http://www.nzffa.org.nz/farm-forestry-mo...
If I am wrong, then I apologize and suggest, that you check other Scoliidae, like for example Campsomeris sp.. Good luck!