Halticorcus sp.
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P6140208 (20)
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P6140225 (20)
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P6140233 (20)

The pictures below showed the damages done by this beetle on its host plant, Giant Sword Fern (Nephrolepis biserrata):

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P6210123 (20)
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P6210126 (20)

Dr. Cheong Loong Fah had indicated this beetle may be a Halticorcus sp. or Argopistes sp. I had indicated it as Halticorcus sp. as there is another species in this genus, Halticorcus platycerii (Australian flea beetle), found in Australia that also feed on fern.