Wow! I have never seen this beetle larvae before, but I believe I know its group.
This is a Chrysomelidae leaf eating beetle larva belonging to the Paropsine group. There are several genera in this group and it could be Paropsis.
Larvae of these paropsine beetles characteristically have the spots, dots and multitude of colours as seen in your image.
Take a look at this link:
http://www.oocities.org/brisbane_leafbeetles/BrownLeafBeetles.htm
Best wishes,
Ken
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