494 MESSRS. OLDPIBLD THOMAS AND M. A. C. HINTON ON 



the ear. Oheeks grey, but a distinct whitish collar running up 

 from the throat towards the ear. Hands and feet white, with 

 small darker metapodial patches. Tail strongly pencilled, deep 

 black. 



Skull with bullae smaller than in loringi, larger than in short- 

 ridgei. 



Dimensions of the type, measured in the flesh : — 



Head and body 160 mm. ; tail 191 ; hind foot 30 ; ear 22. 



Skull : front of incisors to back of m^ 18"8 ; palatal foramina 

 8'7 ; upper molar seiies 5*9. 



Hah. Mossamedes. Type from Bombon^, altitude 3200' ; other 

 specimens from Ponangkuma 3300'. 



Type. Adulb male. B.M, No. 9. 10. 1. 49. Original number 

 17. _ Collected 11 March, 1906, by Dr. W. J. Ansorge. Six 

 specimens. 



A very well-marked species, with its black facial lines, white 

 belly, whitish collar, and bushy black tail. 



T. scotti, sp. n. 



General colour pale greyish buffy becoming stronger bufty on 

 the rump, sides greyer bufty ; under surface sharply defined pure 

 white, the liairs white to their bases. Head grey ; facial streaks 

 present, in the form of a blackish clouding round the eyes, but 

 far less developed than in T. nitela. Ears with fine butfy hairs 

 and a buffy tuft at their anterior base. An indistinct whitish 

 collar perceptible below ears. Hands and feet white, the latter 

 wholly white, the former with small dark metatarsal patches. 

 Tail as usual greyish brown basally, black for the greater part of 

 its length, not very bushy. 



Dimensions of the type, apparently not fully adult : — 



Head and body 140 mm. ; tail 150 ; hind foot 24. 



Ilab. British East Africa ; type from the Yata Plains, two 

 days' march East of the Thika lliver where it joins the Tana. 

 Altitude 4000'. 



Type. Immature female. B.M. No. 12. 5. 19. 17. Collected 

 19 November, 1911 and presented by R. L. Scott, Esq. 



By its reduced facial markings and wholly white belly hairs 

 this species is readily distinguishable from the other East African 

 form, T. loringi, while its paler general colour is also characteristic. 



We have named it in honour of its collector Mr. li. L. Scott, 

 to whom the National Museum owes many important donations.] 



" Entirely arboreal, and confined to the tree belt that fringes 

 the Orange lliver. This belt is liable to partial or complete 

 inundation during the frequent rising of the river, being 

 occasionally under water to a depth of from six to ten feet, at 

 which times these rats must live entirely among the topmost 

 branches of the trees. 



Shy, and a very active tree climber. Apparently mainly 

 nocturnal, although occasionally to be seen high up among the 

 branches of trees in the early evenings before sunset, so that 

 during the cold season they may become partly diurnal. Breeding 



