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Oncocoris insulanus
Ashish, looking closer I agree with your suggestion. I was troubled by the different color and lighter edges. Your species share a black patch on each side and white tip of the scutellum.
Martin isn't this what I mentioned in my suggested Link...?
http://www.brisbaneinsects.com/brisbane_...
I think you have Oncocoris insulanus (shield bug)
http://www.brisbaneinsects.com/brisbane_...
Some of the images are darker, like yours.
Ary and Adarsha... always verify your suggestion specie where it find befor making suggestion... so your suggestion would not be wrong.
It certainly not looks like a mermorated stink bug!
http://bugguide.net/node/view/545497