Tettigonoidea, most probably Tettigonidae. This is a ant mimicking katydid nymph, probably an earlier instar.
http://liewwk-macro.blogspot.ch/2010/12/new-found-ant-katydid-hopper-cricket.html#
http://photography-on-the.net/forum/showthread.php?t=921569
http://www.photographersdirect.com/buyers/stockphoto.asp?imageid=2994925
http://www.photographersdirect.com/buyers/stockphoto.asp?imageid=3127827
http://www.masterfile.com/stock-photography/image/848-02844059/Katydid-(Polichne)-nymph-mimicking-Green-Tree-Ant-(Oecophylla-smaragdina)-Australia
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