I am guessing it might be the larva of a beetle in the subfamily Epilachninae (in the Coccinellidae family)
http://en.wikipedia.org/wiki/Epilachninae
Also have a look at
http://entnemdept.ufl.edu/creatures/veg/bean/mexican_bean_beetle.htm
http://www.brisbaneinsects.com/brisbane_ladybirds/28-spotted.html
http://www.biodiversityexplorer.org/beetles/coccinellidae/epilachna_dregei.htm
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