124 



MILLER 



length of nasals ii (lo) ; greatest width of both nasals together 5 (5) ; 

 interorbital breadth 12 (11.4) ; zygomatic breadth 33.4 (20) ; mastoid 

 breadth 17 (16.6) ; depth of braincase at anterior edge of basi-occipital 

 13.6 (13) ; mandible 23 (33) ; maxillary toothrow (alveoli) 6.4 (7) ; 

 mandibular toothrow (alveoli) 7 (7). 



Speciviens examined. — Two, both from the type locality. 



Remarks. — While Sciiirus lingunge7isis is scarcely distinguishable 

 from S. natiutensis by external characters alone, size of the skull and 

 form of the audital bullae are clearly diagnostic. Both species from 

 the Natunas are separated from the Bornean 6*. loxvi Thomas by their 

 well developed ears, and shorter broader rostral portion of skull. 



SCIURUS LUTESCENS sp. nov. 



1894. Sciurtis notatus Thomas and Hartert, Novitates Zoologicae, i, p. 659. 

 September, 1894 (part, specimens from Sirhassen). 



Type. — Adult male (skin and skull) No. 104668 U. S. National 

 Museum. Collected on Sirhassen Island, South Natunas, June 3, 

 1900. Original number 429. 



Characters. — Allied to Sciurtis noiatus., but considerably smaller 

 than the Bornean representative of the species. Colors very pale, the 

 under parts buff or cream-buff (Ridgway, pi. v, nos. 13 and 11) ir- 

 regularly tinged with gray. 



Color. — Entire dorsal surface of body and tail a fine grizzle of black 

 and cream-buff, the individual hairs black with two or three cream 

 buff rings. On tail the grizzle is less fine than on back, and it shows a 

 faint tendency to resolve itself into obscure cross bands. On sides of 

 body and on head the cream-buff brightens to buff. Cheeks and 

 muzzle buff, scarcely grizzled. Feet slightly yellower than sides, 

 under parts and inner surface of legs pale buff, palest anteriorly and 

 laterally (where it about matches the cream-buff of Ridgway) bright- 

 est along median line. Under side of tail dull ochraceous-buff slightly 

 grizzled with black. Pencil not different from rest of tail. Between 

 the colors of sides and belly are the usual longitudinal stripes. The 

 outer of these is about 5 mm. in width, and cream-buff in color. 

 The inner is about twice as wide, and black, but much obscured by a 

 thick sprinkling of bluish gray hairs. Outer surface of ears concolor 

 with neck, inner surface like cheeks. The sprinkling of bluish gray 

 hairs on sides of belly extends irregularly forward to axilla and inner 

 side of front leg, occasionally to throat and chin. 



Skull. — As compared with the Bornean form of Sciurus notatus^ 

 the skull of 6". lutescens is much smaller (greatest length about 45 in- 



