The white-headed' spiny trapdoor spiders of the Euoplos mcmillani-group are revised, and three new species are described from the biodiversity hotspot of south-western Western Australia: E. cornishi sp. nov., E. kalbarri sp. nov. and E. saplan sp. nov. Two previously described species, E. ballidu (Main, 2000) and E. mcmillani (Main, 2000), are further re-described and re-diagnosed. The mcmillani-group of Euoplos are remarkable for the unique bright white' carapace coloration of males, and we here document the known diversity and conservation status of these rare and enigmatic spiders.