I found this link with info on Myllocerus undatus Marshall - Sri Lanka Weevil or Asian Gray Weevil. It looks remotely like your spotting, but I wouldn't dare to say it is it. Not sure at all.
http://www.famu.edu/cesta/iframeapps/Invasive_Weevil_Species/Desktop/Myllocerus_undatus_Marshall_-_Sri_Lanka_Weevil_or_Asian_Grey_Weevil.htm
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