Hyphydrus danin. sp. is described from the highlands of West New Guinea. This species is probably the sister species ofH. elegans(Montrouzier 1860). In addition, collecting notes onH. daniandH. lyratusSwartz 1808 are provided. The latter is reported from Bali, Lombok, Flores and Ceram for the first time, and the Balinese locality represents the first report of the species from paddy field waters. Faunistic data onH. decemmaculatusWehncke 1877 andH. elegansas well as notes on the type material ofH. curvipesRégimbart 1892 and ofH. gibbicollisRégimbart 1892 are reported.