The western chestnut pseudomys is recorded in grasslands and woodland in Western Australia. It has chestnut to dark upperparts, a pale underside, and a black tail tuft.
The upperparts are chestnut to dark, the underside is pale, and the tail ends in a black tuft.
The Avon-region guide describes it as mainly nocturnal and terrestrial, with records from open grassland and woodland.
An extinction-risk assessment has not been added yet.