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Parasa lepida
3 cm long. According to the locals, they may cause severe burn on skin.
I found it in a durian tree (Durio zibethinus) in a newly developed residential area.
Thanks to BartVD (http://www.projectnoah.org/users/BartVD) for ID suggestion. Just to go along with wikipedia, I use Parasa lepida rather than P. philepida.