Taterillus arenarius Robbins, 1974 . Proc. Biol. Soc. Washington, 87:399.

TYPE LOCALITY: Mauritania, Trarza Region, Tiguent .

DISTRIBUTION: N Sahel savanna and subdesert from Mauritania and through Mali to Niger (see Robbins, 1974); eastern limits unknown although Sicard et al. (1988) believed the species to be confined to the left bank of the Niger River .

COMMENTS: Robbins (1974) compared his new species with samples of T. gracilis and T. pygarus . The latter and T. arenarius are sympatric in S Mauritania.