Odontomachus rixosus Smith, 1857

Material examined. Bukit Batok East, 1.34304, 103.76235, Sep 2016, G.W. Yong leg., ZRC _ HYM_0001294-1295; Bukit Timah Nature Reserve, 19 Feb 2016, collector unknown, ZRC _ ENT00000723 ; same locality as previous, 1.35386, 103.77988, 23 Aug 2017, W. Wang leg., ZRC _ ENT00007559; same locality as previous, 15 Aug 1983, D.H. Murphy leg., ZRC _HYM_0000669; same locality as previous, plot III-2, 19 Apr 2016, D.J. Court leg., pitfall trap, ZRC _ ENT00048454; males, Bukit Timah Summit, 13-22 Apr 2009, Z. Chen leg., malaise trap, ZRC _ ENT00048020- 48022 ; Catchment forest, 15 Sep 1964, D.H. Murphy leg., ZRC _HYM_0000663; Lower Peirce Reservoir, 11 Aug 1990, collector unknown, ZRC _ ENT00000109 ; same locality as previous, 7 Aug 1990, collector unknown, ZRC _ ENT00000122; same locality as previous, 31 Jul 1990, collector unknown, ZRC _ ENT00000209; MacRitchie Reservoir, 9 Jan 2014, Sk. Yamane leg., ZRC _HYM_0000424; Mandai, 1.40661, 103.78848, 13 Nov 2018, W. Wang leg., ZRC _ ENT00007586 ; Mandai Road, Nov-Dec 2016, G.W. Yong leg., ZRC _HYM_0001303-1322; male, Pulau Ubin, PU 1, 1°24’36.3”N, 103°59’25.5”E, 23- 30 Jun 2012, J. Puniamoorthy et al. leg., malaise trap, Reg. 29319, ZRC _ BDP0016035; Seletar Trail, 1.39097, 103.79952, 7 Dec 2015, M.K.L. Wong leg., Winkler extraction, ZRC _ ENT00000722 ; Upper Thomson Nature Park, 1.38311, 103.79839, Oct 2016, G.W. Yong leg., ZRC _HYM_0001298-1302 .

Material not physically examined. Syntype – CASENT0900656, ANTC19758 (BMNH) . Non-types – ANIC32-031703, RWTacc.68.11 (ANIC); ANIC32- 031673, Shattuck134500711 (ANIC); CASENT0217544, ANTC17803 (CASC); FMNHINS0002821936, FMHD_81-282 (FMNH).

Literature. Type – Smith (1857). Viehmeyer (1916); Overbeck (1924); Tan & Corlett (2012); Satria et al. (2015).

Localities. Bukit Batok East; Bukit Timah Nature Reserve; Bukit Timah Road; Lower Peirce Reservoir; MacRitchie Reservoir; Mandai; Mandai Road; Pulau Ubin; Seletar Trail; Singapore Botanic Gardens; Upper Thomson Nature Park.

Habitat/Ecology. This species is associated mostly with primary and old/mature secondary forests in Singapore, but has sometimes also been found in more degraded or disturbed young secondary forests, including mangrove back forest. Individual foragers have occasionally been collected from under bushes beachside, presumably originating from adjacent coastal beach forest. These ants were often found foraging in and around leaf litter.

Remarks. Type locality in Singapore.