Notomys alexis Thomas, 1922 . Ann. Mag. Nat. Hist., ser. 9, 9:316.

TYPE LOCALITY: Australia, Northern Territory, 35 miles SW of Alroy, 800 ft (see Mahoney and Richardson, 1988:166) .

DISTRIBUTION: Australia; Western Australia, Northern Territory, South Australia, and W Queensland (see map in Watts and Aslin, 1981:109).

SYNONYMS: everardensis, reginae.

COMMENTS: Of all the species of Notomys, N. alexis has the most extensive geographic range (Watts and Aslin, 1981). Variation in sperm head morphology documented by Breed and Sarafis (1983).