The spider genus Corasoides Butler, 1929 (Araneae:Desidae) is revised and nine new species described, four from Australia (C. terania sp. nov., C. mouldsi sp. nov., C. motumae sp. nov. and C. occidentalis sp. nov. and five from New Guinea (C. angusi sp. nov., C. stellaris sp. nov., C. nimbus sp. nov., C. cowanae sp. nov. and C. nebula sp. nov.). Keys to all species in the genus are provided. Phylogenetic relationships are constructed by means of cladistical analyses. Separate lineages of Australian and New Guinea species are revealed.