July 2006; Sai Kung Country Park. Individual foraging for construction material, in this case dried bamboo

Polistes olivaceus is easily confused with P. japonicus. Ground color and general morphology are rather similar, only inspection of the thoracic details (carinas, punctuation etc) permits a positive identification.
The images below give a detail “habitus” of this species which can be compared with that of P.japonicus.

Polistinae: Polistini: Polistes olivaceus (DeGeer, 1773), sub-genus Gyrostoma.
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July 2006, Sai Kung Country Park. A thriving colony affixed to the underside of a roof overhang. This colony would be later attacked by Vespa ducalis, the entire brood destroyed and the nest abandonned.