Mammals from Ituwcnzori. 121 



JIah. Belli, Scniliki River. AU. 3000'. 



Ti/pe. Adult male. B.M. no. C. 12. 4. G4. Ori^^lnal 

 iiunlbei- 1;');^ Colleclotl 22nd July, lOOG, by R. E. Dent. 



'i'his liiuidsome squirrel is no doubt ne;irly allied to 

 S. r. vyausd'^ but in the very fine speckling of the body and 

 its greyer colour shows a relationship to the form found in 

 the Gaboon, to which the name of S. r. Aiilryi, ]\1.-Edw.*, is 

 applicable. The latter, however, has not the richly rufous 

 feet characteristic of both the Central-African subsjiecies. 



It may be noted that the Ruwenzori .'quirrel described by 

 Schwann as a sulspccies of S. rvfohrachiatus f proves, on the 

 arrival of a good series, to be a quite distinct sjieciis, charac- 

 terized not only by its greenish ( livaceous colours, the absence 

 of red on the limbs, and its white ventral line, but by its 

 possession of two upjier premolars, S. riifuhrachiutus having 

 only one. It should therefore stand as L. rutvevzurii. 



TiiAMNOMYS, gen. nov. {J/iin'na). 



Type t Th. venustus, sp. n. 



In pointing out recently the advisability of gcnerically 

 distinguishing Micromijs from Mus^ on account of its posse?^- 

 eion of the "a:^' or postero-internal cusp on its fir.-^t and 

 eecond upper molars, I mentioned that two African s})ecies, 

 hitherto assigned to J/ms — J/, arborarius and rutilans — 

 possessed the same character ; and I now take this occasion 

 to se])arate them and their allies also from the ])arent genus, 

 •which greatly needs reducing. From Micromys^ which is 

 entirely Pahearctic, they may be distinguished by being- 

 tree- or bush-, instead of terrestrial niico, and by having 

 therefore the usual pencilled tail found in such forms. 



The genus T/ianmomys divides into two sections — the one 

 consisting of Peters's J/«s rutihms and the new Ruwenzori 

 species T/i. vemistus, which I })ropose to take as t})je of 

 the genus; and (2) the less strongly marked group containing 

 Miis duh'churus, fcSmuts, xl/. arborarius, Peters, and their 

 allies. 



* Sciurus Aubn/i, M.-Edw. Rev. Zool. xix. p. 228 (18G7). Slated by 

 Jeutiiik and TrouL'ssnrt to be based on n young specinien of the <S'. ru/u- 

 Iruchlatus group. Collected by Aubiv Le Conte in the Gaboon. 



t Ann. & Mag. Nat. Hist. (7) xiii. p. 71 (U)04). 



\ Th. vcnndns is selected as tlie type in order to avoid any po5.«iblo 

 complication which might arise should our e.xaniples of Mus ridiluus, 

 I'eters, i>rove to be wrongly deteimlned. This course is the more advis- 

 able as I'eters says of rutilatts, " l^ackziibne yuii gewolmlielieii I'ropor- 

 tionen," ns though there were nothing special about llie dentitii n. 



§ Ann. & Mag. Nat. Hist. (7) xv. p. 492 (ItlOo). See aLo oi>. cit. (7) 

 xvii. p. 8o (liXHi). 



