The new subgenus Whartonstigma subgen. nov., with type species Orthostigma gallowagi Wharton 2000, of the genus Orthostigma Ratzeburg, 1844 is described and illustrated. Two new species: Orthostigma (Whartonstigma) longipede sp. nov. and O. (W.) papuae sp. nov. are described from Papua New Guinea. A key to all known species of the subgenus Whartonstigma is provided.
Keywords: Hymenoptera, Braconidae, parasitoid of Diptera, Aspilota-complex, Orthostigma, Papua New Guinea, new subgenus, new species, key.