Pristomyrmex costatus Wang, 2003

Material examined. Mandai, 1.40144, 103.77702, 7 Apr 2016, M.K.L. Wong leg., Winkler extraction, ZRC _ ENT00000696 ; Prince George’s Park Residences (NUS), 1.29239, 103.7787, 3 May 2017, W. Wang leg., ZRC _ HYM_0001171; same locality as previous, 6 Dec 2017, Sk. Yamane leg. (SKYC); Seletar Reservoir, 16 May 1994, collector unknown, NS 134B, ZRC _ ENT00000266 ; Upper Thomson Road, 2 Oct 2016, G.W. Yong leg., ZRC _ HYM_0001046; Western Catchment, 1.40866, 103.70185, 20 Nov 2015, M.K.L. Wong leg., ZRC _ ENT00000695 .

Material not physically examined. In Wang (2003) but specimen repositories not specified – Nee Soon Swamp forest, R.W. Taylor leg., collection date unavailable; Bukit Timah Nature Reserve, D.H. Murphy leg., collection date unavailable.

Literature. Wang (2003).

Localities. Bukit Timah Nature Reserve; Mandai; Nee Soon Swamp Forest; Prince George’s Park Residences (NUS); Seletar Reservoir; Upper Thomson Road; Western Catchment.

Habitat/Ecology. This species is associated mostly with old/mature secondary forests in Singapore, including native-dominated forest and swamp forest. It was sometimes also found in young abandoned plantation secondary forest fragments. Levels of disturbance vary widely between forest sites. Individuals of this species were usually found in leaf litter, sometimes on tree branches. Nests were collected from rotten logs.