Mike Hoeta in Northland sent in this photograph:
http://www.monarch.org.nz/monarch/2012/02/06/what-is-this-please/
Norm has identified it as a Varied Swordgrass Brown (Tisiphone abeona) an Australian butterfly. The species has six subspecies which vary considerably in their markings. The larvae feed on Gahnia species.
It's not clear if the butterfly was observed in Northland or not... perhaps more info. to come.