Polyrhachis (Myrmhopla) bicolor Smith, 1858

Material examined. Kranji Road, 1.4238, 103.75413, 10 Nov 2016, G.W. Yong leg., tree trunk, KR1TH1399, ZRC _HYM_0001177.2; Sungei Buloh Wetland Reserve, 8 Jan 2014, Sk. Yamane leg., nest between leaves, SG14-SKY-28, ZRC _HYM_0000460; Lim Chu Kang, 20 May 1976, C.S. J. leg., ZRC _HYM_0000906; Mandai mangrove, 2 Oct 1978, D.H. Murphy leg., ZRC _ HYM_0000976; same locality, collection date and collector as previous, DHM-SG78- Poly 1, ZRC _ ENT00014141; Prince George’s Park Residences (NUS), 1.292389, 103.778694, Apr 2015, M.S. Foo & W. Wang leg., malaise trap, ZRC _ BDP0044269, 45587; Western Catchment, 1.408657, 103.701849, 20 Nov 2015, M.K.L. Wong leg., ZRC _ ENT00000731 .

Material not physically examined. CASENT0217750, ANTC1952 (CASC).

Literature. Viehmeyer (1916); Overbeck (1924); Mezger & Moreau (2015).

Localities. Bukit Timah; Bukit Timah Road; Kranji Road; Lim Chu Kang; Mandai mangrove; Sungei Buloh Wetland Reserve; Western Catchment.

Habitat/Ecology. This species was mainly found in mangroves, or young secondary habitats including waste woodlands and disturbed secondary forest fragments within urban or semi-urban settings, in Singapore. In mangroves, nests were found between leaves, or in ‘silk-webbed’ leaves of Sonneratia; individuals were sometimes collected from tree trunks or foliage above ground.

Remarks. There is considerable morphological variation between populations of this species. For the purposes of this checklist, we tentatively treat all morphological variants as conspecific, pending more concrete empirical evidence for species differentiation in future.