Diacamma rugosum (Le Guillou, 1842)

Material examined. Lower Peirce Reservoir Road, 21 Jul 1990, H.K. Lua leg., ZRC _ HYM_0000072; Pulau Ubin, 1.41662, 103.99443, 4 Dec 2016, G.W. Yong & M.K.L. Wong leg., ZRC _HYM_0001093; same locality, collectors, and collection date as previous, Jalan Sam Heng, 1.412604, 103.99317, ZRC _HYM_0001094 .

Material not physically examined. Unknown.

Literature. Forel (1907, 1911) [as Diacamma rugosum birmanum; see Remarks]. Tan & Corlett (2012).

Localities. Central Catchment Nature Reserve; Lower Peirce Reservoir Road; Pulau Ubin.

Habitat/Ecology. This species is associated mostly with old/mature secondary forests in Singapore, often disturbed forest fragments in semi-urban settings, less frequently in primary forest.

Remarks. At the time of writing, there is much uncertainty surrounding the species D. rugosum and the taxonomic validity of its 21 valid subspecies. Given the taxonomic uncertainties at the time of writing, we therefore considered all subspecies of D. rugosum (e.g. D. rugosum birmanum) as conspecific to the species for the purposes of this checklist. We recognize the possibility that at least some of these subspecies might be raised to species status in future, which should entail a revision of Diacamma species in this checklist.