Pseudomys chapmani Kitchener, 1980 . Rec. West. Aust. Mus., 8:405.

TYPE LOCALITY: Australia, Western Australia, Pilbara Dist., East Hammersley Range, West Angelas Mine Site (Kitchener, 1980 provided additional information) .

DISTRIBUTION: Australia, NW Western Australia; extant specimens known only from Pilbara Dist. (see map in Kitchener, 1985:216), but distribution of pebble mounds indicated range once extended through Gascoyne to Murchison Dist. with southern limit near Mileura, northern limit the Great Sandy Desert, and eastern limit the Gibson Desert (see discussion and map in Dunlop and Pound, 1981).

COMMENTS: This species builds pebble mounds and is sympatric with P. hermannsburgensis (Kitchener, 1980), which does not construct pebble mounds (Dunlop and Pound, 1981), but phylogenetically most closely allied to P. johnsoni, another species that constructs pebble mounds (Kitchener, 1985).