NO. 1577. MA3fMALS COLLECTED IN WESTERN BORNEO— LYON. 555 



The two skins from Pulo Kubu (Cat. Nos. 142327, and 142328, 

 U.S.N.M.) differ from the rest of that series in beinsi; slightly larger 

 and in having the shoulder area tawny-ochraceous and the wliite 

 on the thighs with scarcely any admixture of black. 



SJcull and teeth. — Apparently there are no constant differences 

 by which skulls of Sciurus sanggaus may be distinguished from 

 those of related species. 



Measurements. — See table, page 556. Sciurus sanggaus averages 

 slightly smaller than S. borneoensis. 



Specimens examined. — Twenty-one; see table, page 556. 



Bemarks. — It is possible the two specimens from Pulo Kubu may 

 represent a race distinct from the typical form. They average slightly 

 larger than the rest of the series and differ somewhat in color as 

 already noted. Except for a slightly smaller size they are practically 

 indistinguishable from specimens of Sciurus hangkanus. 



[The Sciurus raffiesi [or j)fevostii] class was particularly interesting 

 and there is a large series. All those from the left bank of the 

 Kapuas (facing sea) have black tails and all from the right bank 

 and its adjacent islands have gray tails and are much more variable. — 

 W. L. Abbott.] 



SCIURUS DULITENSIS (Bonhote^ 



J901. Sciurus viftntitK di(litensis Bonhote, Ann. Mag. Nat. Hist., 7th ser.. VII, 

 May, 1901, p. 451. 



Doctor Abbott secured nine plantain squirrels in western Borneo 

 whicli may be referred to this species. I have seen no examples 

 from jSIount Dulit, but Doctor Abbott's specimens do not differ 

 essentially from plantain sc[uirrels from Sarawak, though they 

 apparently have less yellow on cheeks, sides of neck, and forearm. 

 In color of the underparts, size and distinctness of the lateral stripes, 

 the west Borneo squirrels show considerable variation, but it does 

 not seem to be correlated with definite areas as in the case of the 

 prevostii group of squirrels. For measurements see table, page 557. 



