Proceratium papuanum Emery, 1897

Material examined. Queen, Pulau Ubin, 1.41662, 103.99443, 4 Dec 2016, G.W. Yong & M.K.L. Wong leg., ZRC _HYM_0001092; queen, Sungei Buloh Wetland Reserve, 28 Mar 2018, W. Wang leg., ZRC _ ENT00000961 .

Material not physically examined. Unknown.

Literature. None. New record.

Localities. Pulau Ubin; Sungei Buloh Wetland Reserve.

Habitat/Ecology. This species was identified based on queens collected from disturbed old/ mature secondary forest, and also mangroves. Actual nesting sites are unknown.

Remarks. The queens from Singapore identified as P. papuanum confer mostly with the original description of the species, but differ from the holotype queen in terms of body coloration – the Singapore queens appear darker in coloration. At the time of writing, we undertake the assumption that this might be a case of intraspecific variation among allopatric populations.