Petromyscus shortridgei Thomas, 1926 . Proc. Zool. Soc. Lond., 1926:302.

TYPE LOCALITY: Extreme S Angola, Rua Cana Falls, 3350 ft .

DISTRIBUTION: W and S Angola and N Namibia (S to Erongo Mtns and Okahandja region); limits unknown; see map in Skinner and Smithers (1990:316).

COMMENTS: Roberts (1951) treated shortridgei as a subspecies of P. bruchus, and Meester et al. (1986) listed it as a subspecies of P. collinus . However, Thomas correctly expressed the distinctness of the animal by describing it as a species, which was also Schlitter's evaluation (in Meester et al., 1986), and that of Skinner and Smithers (1990). The larger size of shortridgei, darker fur with a less silky texture, and lack of postaxillary teats clearly separate it from P. collinus, a judgement based upon specimens in the American Museum of Natural History and the Field Museum of Natural History. Our estimate of its geographic range, which overlaps that of P. collinus, is also derived from those series.