170 MESSRS. O. THOMAS AND R. C. WROUGHTOX OX [Mar. 17, 



Skull : greatest length 44 mm. ; basilar length 35 ; zygomatic 

 breadth 23 ; length of upper molar series 7 ; bullae 11. 



Hah. Tambarara, Gorongoza Dist., P. E. A. Alt. 1300 ft. 



Type. Adult male. B.M. No. 8.1.1.79. Collector's number 1838. 

 Taken 20th March, 1907. 



The second specimen, an adult female, is rather smaller, but the 

 hind foot, ear, upper molar row, and bullae are exactly as in the 

 type. (The collector records " Ear 22," but this is an evident 

 mistake.) 



The appearance of this veiy distinct foi-m in this I'egion is 

 intei'esting. The Gerbils found at Mazoe on the high plateau to 

 the west and at Beii'a at sea-level to the south are i-aces of 

 T. lobengulce, while the forms north of the Zambesi ai-e shoi-t- 

 tailed ones. This is apparently a species confined to the 

 mountainous Goi'ongoza country and is perhaps allied to T. draco, 

 also an animal with a very restricted habitat on the Drakensberg 

 at Wakkerstroom. 



In Wroughton's key to the species of the genus Tatera (A. M. 

 N. H. xvii. p. 475, 1906) this species would come next to 2\ afra, 

 from which it may be distinguished by its longer hind foot and 

 ears (viz. 39 and 27 to 34 and 24 respectively in T. afra), its, 

 longer, narrower skidl, and larger teeth. 



" Native name, ' Mpynya.' 



" Apparently not common, the soil not being suited to its 

 habits." 



18. Arvicanthis dorsalis Sm, 



5 . 1799, 1808, 1816, 1817. $ . 1800, 1804, 1806, 1807, 1811, 

 1812. 



" Native name, ' Mhoni.' 



*' Veiy common everywhere, especially in the native ' lands.' 



" Diurnal only." 



19. Saccostomus campestris Pet. 



6 . 1822, 1832, 1835, 1863, 1883. 



The series of specimens of the genus Saccostomus, like that 

 from Beira, seems to contain two forms separable by size, and for 

 these we adopt as before the names S. campestris and ;S'. maskonce. 



" Native names, ' Tuda ' and ' Suka.' 



" Common in the natives' ' lands ' and along the banks of the 

 streams, 



" Nocturnal and strictly vegetarian." 



20. Saccostomus biashox.e de Wint. 

 6. 1834, 1878, 1882. $. 1836. 



21. Mus RATTUS Linn. 

 6. 1826. $. 1853 «. 



