Carebara castanea Smith, 1858

Material examined. Alate queen, Pulau Ubin, 1.41149, 103.97475, 22 Oct 2015, S.X. Chui et al. leg., ZRC _ ENT00047836 ; alate queen, Kent Ridge Road, 1.29518, 103.77615, 2 Nov 2015, Y.G. Tan leg., ZRC _ ENT00047837 .

Material not physically examined. Unknown.

Literature. None. New record.

Localities. Kent Ridge Road; Pulau Ubin.

Habitat/Ecology. Alate queens were found, sometimes en masse, in secondary forest patches or fragments in semi-urban settings.

Remarks. At the time of writing, the only records of this species in Singapore are of alate queens. The alate queen of C. castanea closely resembles that of Carebara lignata Westwood, 1840, however, its post-petiole appears broadest (in dorsal view) anteriorly, unlike in C. lignata .