Crematogaster sewardi Forel, 1901

Material examined. Admiralty, 4 Feb 2015, W. Wang leg., ZRC _ ENT00048400; Bukit Timah Nature Reserve, NS 202, 4 Dec 1995, H.K. Lua et al. leg., ZRC _ ENT00000357; same locality as previous, 5 Feb 1983, D.H. Murphy leg., ZRC _HYM_0000705-707; Commonwealth Road, 1.31115, 103.78171, 24 Nov 2016, G.W. Yong leg., CW1TH633, ZRC _ HYM_0001762; Kent Ridge, 28 May 1985, D.H. Murphy leg., ZRC _HYM_0000701; Lower Peirce Reservoir, 21 Jul 1990, H.K. Lua leg., ZRC _HYM_0000139; Mandai forest, 15 Jan 2020, W. Wang leg., foraging trail on tree trunk, WW-SG20-007, ZRC _ ENT00047968; National University of Singapore campus (Clementi/Kent Ridge), Apr-Sep 2015, M.S. Foo & W. Wang leg., malaise trap, ZRC _BDP (multiple); Nee Soon forest, 16 Aug 2017, W. Wang leg., WW-SG17-065, ZRC _ ENT00047969; Pulau Ubin, 7 Jan 2014, Sk. Yamane leg., ZRC _HYM_0000361-363; same locality as previous, PU3, 1-8 Sep 2012, J. Puniamoorthy et al. leg., mangroves, malaise trap, Reg. 29451, ZRC _ BDP0016447- 16448; Sungei Buloh, Feb 2015, R.Z.B. Quek leg., mangroves, ZRC _ ENT00007861; Upper Peirce Reservoir, 10 Jan 2014, Sk. Yamane leg., ZRC _HYM_0000360 .

Material not physically examined. Locality unknown, 4 Dec 1995, Sk. Yamane leg. (SKYC); locality unknown, 23 Jul 1996, Sk. Yamane leg. (SKYC) [examined in Hosoishi & Ogata 2008, 2009].

Literature. Hosoishi & Ogata (2008, 2009); Wang et al. (2018a).

Localities. Bukit Timah Nature Reserve; Commonwealth Road; Kent Ridge; Lower Peirce Reservoir; Mandai; National University of Singapore campus (Clementi/Kent Ridge); Pulau Ubin; Sungei Buloh; Upper Peirce Reservoir.

Habitat/Ecology. This species was often found in disturbed secondary forest fragments including waste woodland and abandoned park forests, and also cultivated park areas within semi-urban settings or near urban dwellings. Sometimes these ants were found in mangroves, typically on tree branches or tree trunks. Nests have been found in tree holes.

Remarks. As C. sewardi is morphologically very similar to C. difformis, it is possible that the latter species as identified in Viehmeyer (1916) and Overbeck (1924), may have been misidentified C. sewardi .