Manchester Memoirs, Vol. li. (1907), No. 5. 23 



it. From nyikce as from its other neighbour chrysophilns 

 its short tail at once separates it, and its broader skull 

 and much larger bullae serve to further distinguish it from 

 nyikce. 



" ' Mtuku ' of the local natives. Inhabits swampy- 

 grass country and is seldom trapped." 



Mils. sp. (multimammate). 



R. 4? {yg-)- S. bank of Zambesi. May 27, 1904. 

 Alt. 1250. 



R. 12? (yg-)- North of Zambesi. July 14, 1904. 

 Alt. 1500. (No skull). 



R. 20^. Ntambvva's. Aug. 6, 1904. Alt. 1400. 



R. 22 (J. Portuguese East Africa. Aug. 26, 1904. 

 Alt. 1400. 



R. 72 ^(yg.), 73 ? . Petauke. March 13, 1905. Alt. 

 2400. 



R. 80$. Petauke. March 29, 1905. Alt. 2400. 



(R 99cJ?). Mbala Country. May 6, 1905. Alt. 2600. 



? <J. ■? ? ?' 



Mr. Thomas, writing (P. Z. S., 1897, p. 936) on some 

 rats similar to these from Nyasa, spoke of them as 

 " belonging to the groups characterized respectively by 

 "their numerous mammae (multimammate) and by having 

 "the mammary formula 3 — 2=10. It is impossible to 

 " work them out more definitely at present." No one has 

 yet so far as I know, tackled this problem. The present 

 specimens seem to belong to a form having 8 pair of 

 mammae. 



" ' Mtika " of all the local tribes. This species swarms 

 all over the country. I have trapped as many as 80 

 specimens in a single night." 



Thamnomys dolichurus. 



Mus dolichurus, Smuts, " Enum. Mamra. Cap.," p. 38, 1832. 

 Mus arborarius, Peters, " Reis. Moss.," p. 152, 1852. 



