,"> I ^[r. O. Tlioniiis ou new 



Tail lonjr, not so busliy as in some jnenibcMS of tlic •iioup, its 

 liairs for the proximal six inches ringed basally with black 

 and dnll yellow, with broad flaming orange tips, which 

 gradually s]iread downwards till on the terminal half of tlie 

 tail the hairs are wholly orange to their bases. IMammre 8. 



Skull stout and heavy, its muzzle not abnormally narrow. 



I'imensions of the type (measured in the flesh) :• — 



Head and body 285 mm. ; tail 313 ; hind foot, s. u. 05, 

 c. n. 70 ; ear 31. 



Skull : greatest length G8 ; basilar length 53 ; zygomatic 

 breadth 40 ; nasals 21 X 10*5 ; interorbital breadth 23; palate 

 length 29o : length of upper tooth-series 10"1. 



I/ah. La Union, Canra district. Lower Orinoco. 



Tj/pe. Female. B.M. no. 4. 5. 7. 2S. Original number 

 308. Collected 24th October, 1902, by Mr. S. M. Klages. 

 Presented by Oldfield Thomas. One specimen in normal 

 pelage, and a second, presumably the same, showing a 

 partially melanoid condition, with blackish tail and black belly. 



This tine squirrel is most closely allied to S. igniventris 

 (type locality Marabitanas, Rio Negro), but differs by its 

 pure white instead of bright red under surface and by the 

 wholly orange-red colour of the terminal half of the tail. 

 The latter character will also distinguish it from the geogra- 

 phicalh' more distant S. tricolor and S. castiis, the only other 

 white-bellied members of the group. «S'. igniventris tir.difitr 

 (Upper Rio ^leta), with a somewhat similar tail, has, bke 

 its typical subspecies, a wholly red belly. 



Rhipidomys venezuelm fervidua^ subsp. n. 



Stronger coloured and with smaller teeth than true R. Vene- 

 zuela. 



General colour above uniform rich fulvous (near " tawny 

 ochraceous") ; under surface pure sharply defined white. 

 Outer side of limbs like body, inner sides white ; hands buffy 

 white, witli a slight touch of brown on the metacarpus ; feet 

 similar, but the centre of the metatarsus more decidedly 

 brow n. Tail uniformly brown, hairy and pencilled terminally 

 as usual. 



Skull very similar to that of true venezuelce, but the inter- 

 paiietal shorter ant ero- posteriorly and the palatal foramina 

 rather longer, extending luUy to the level of the front edge 

 of ni^. Teeth as usual, but decidedly smaller than in the 

 typical form. 



Dimensions of the type (measured in skin) : — 



Head and body 130 mm. ; tail 13.5 ; hind foot (wet) 

 (s. u.) 27 J ear 17. 



I 



