282 Mr. O. Thomas on 



Remarks. — Although obviously deserving recognition, tliis 

 form is at present represented by poor and scanty material. 

 Two specimens from Liberia and one from Sierra Leone may 

 be definitely referred to it. Yet only one of these (the type) 

 possesses a skull and another is the prepared skin of an 

 animal which lived in the Zoological Gardens some two years. 

 The tail of the type is evidently abnormal in colour, being 

 mixed brown and white for nearly its entire length, only the 

 tips being pure white. 



XXXIX. — Further new African Mammalia. 

 By Oldfield Thomas. 



(Published by permission of the Trustees of the British Museum.) 



Thamnomys macmillani gazellce, subsp. n. 



Size and other essential characters as in true macmillani, 

 but the fore back markedly lighter and greyer than the hind 

 back, the ochraccous wash over the latter not or scarcely con- 

 tinued forwards beyond the middle of the back. Crown and 

 ears also less buffy, the latter greyish brown, except for a 

 small buffy spot at their anterior bases. 



Skull as in maanilluni, except that the anteiior zygomatic 

 plate is broader and projects in front of the upper bridge, 

 while it runs vertically downwards from the latter in the 

 Rudolf form. 



Dimensions of the type (measured in the flesh) : — 



Head and body 112 mm.; tail 150; hind foot 22 ; ear 10. 



Skull: palatal length 12*5; palatal foramina 5*8; zygo- 

 matic plate 2*7 ; upper molar series 4 - l. 



Hob. Chak-Chak, Bahr-cl-G nazal. 



Type. Adult male. B.M. no. 8. 4. 2. 47. Original num- 

 ber 25. Collected 25th Fobruary, 1907, and presented by 

 A. L. Butler, Esq. Two specimens. 



The two Bahr-el-Ghazal specimens are precisely like each 

 other, and equally different from the type of T. macmillani 

 in the characters noted above. 



An imperfect specimen from Fo.t Berkeley, on the Uganda 

 "Nile, seems also referable to the present form. 



Thamnomys surdaster elyonis, subsp. n. 



Size as in true surdaster. General colour markedly paler, 

 more buffy and less ochraceous than in either surdaster or its 



