Leiolopisma baudini n. sp. is described on the basis of a single specimen from the vicinity of Point Culver, Western Australia. The new species is quite distinct and relatively primitive. Its closest living relative appears to be L. entrecasteauxii from southeastern Australia. Brief notes are provided on certain aspects of habitat, female reproduction and colour hues of most of the mainland Australian and Tasmanian species of Leiolopisma, and these data are used to support Rawlinson's (1974b and 1975) suggestion that the Australian species of the genus, at least, form two subgroups. A key is also provided to the described species of Leiolopisma from mainland Australia and Tasmania.