M.UIMALS COLLECTED BY DR. W. L. ABBOTT 225 



Skull. — Skull much like that of Scinriis a)ia}nbensis in size and 

 o-eneral form. The rostrum is more slender, particularly when viewed 

 from below, and the audital bulla) are noticeably different in form. 

 The bullae are so flattened that when viewed from behind (the skull 

 held upside down) they appear to rise scarcely above level of tips of 

 hamulars. Each is constricted near middle by a groove extending 

 from just behind the lateral process of basioccipital over ventral 

 ridge of bulla and disappearing on outer side. This groove, faintly 

 indicated in the related species, is here so greatly developed as strongly 

 to affect the shape of the bullae, particularly when viewed from the side. 



Measurements. — External measurements of type : total length 375 ; 

 head and body 197; tail vertebrae 17S; pencil 60; hind foot 46 (41). 

 Average of six specimens from the type locality : total length 373 

 (361-394); head and body 200 (197-203); tail vertebrae 177 (15S- 

 191) ; hind foot 45.2 (43-47) ; hind foot without claws 41.2 (40-44). 

 Average of four specimens from Pulo Bunoa, Tambelans : total length 

 369 (362-3S2) ; head and body 197 (1S4-210) ; tail vertebra 171 

 (158-191); hind foot 44.7 (44-46.4); hind foot without claws 41.6 



(40-43)- 



The skull is so nearly like that of Sciurus anambcnsis in size that it 



is unnecessary to give detailed cranial measurements. Greatest length 



49; length of nasals 16; greatest breadth of both nasals together 6.6 ; 



width of palate between premolars 6. 



Specimens examined. — Fourteen ; ten from Big Tambelan Island, 

 four from Pulo Bunoa. 



Remarks. — This is another well marked local form of the Sciurus 

 notatus group. Specimens from Big Tambelan Island and Pulo 

 Bunoa do not differ appreciably from each other. 



SCIURUS KLOSSIP sp. nov. 



Type. — Adult male (skin and skull). No. 10167S United States 

 National Museum. From Kaju Ara or Saddle Island, Tambelan 

 group. Collected August 15, 1S99. 



Characters. — A small, blue-bellied member of the Sciurus notatus 

 group, somewhat closely resembling the Bornean S. cr^^/^i' (Thomas), 

 but differing in much duller, more fulvous coloration. Tail with clear 

 black pencil. 



Color. — General appearance of upperparts as in Sciurus anambe7i- 

 sis and 6*. abbottii but light rings on hairs of tail broader and paler, 

 in some specimens producing indistinct cross-bars, and pencil ahvays 



1 At Dr. Abbott's request this species is named after Mr. C. B. Kloss. 



