Crematogaster (Orthocrema) longipilosa Forel, 1907

Material examined. Bukit Timah Nature Reserve, 4 Dec 1995, H.K. Lua et al. leg., NS 201B, ZRC _ ENT00000367; Lower Peirce Reservoir, 28 Jul 1990, H.K. Lua leg., LHK 108, ZRC _ HYM_0000142; Mandai Lake Road, 5 Nov 2016, G.W. Yong leg., ZRC _ ENT00048422; Mandai Road, 1.41155, 103.79015, 21-23 Nov 2016, G.W. Yong leg., M2D1GPc1931, ZRC _HYM_0001764 .

Material not physically examined. Unknown.

Literature. Forel (1912); Viehmeyer (1916); Overbeck (1924).

Localities. Ayer Terjun (archaic place name); Bukit Timah Nature Reserve; Bukit Timah Road; Lower Peirce Reservoir; Mandai.

Habitat/Ecology. This species was mostly found in primary and/or mature secondary forests in Singapore, including native-dominated secondary forest. The ants have sometimes been found in Nepenthes pitcher cups, and also frequently collected with ground pitfall traps.