NO. 21 FIFTY-ONE NEW MALAYAN MAMMALS MILLER 23 



no appreciable differences in color between adult and young-. The 

 Bornean species more nearly resembles that of the Malay Peninsula 

 than it does the Javan 5". nigrovittatus. 



SCIURUS DULITENSIS DILUTUS, new subspecies 



Type. — Adult female (skin and skull), Xo. 1967 12, United States 

 National Museum. Collected at Tanjong Batu, Dutch Southeast 

 Borneo, August 24, 1912, by H. C. Raven. Original Xo. 177. Pre- 

 sented by Dr. W. L. Abbott. 



Diagnosis. — Like Sciurus dulitensis dulitensis but color of under- 

 pays usually more dull and more diluted with white. 



Measurements. — Type: head and body, 194 mm.; tail, 208; hind 

 foot, dry, 44.5 (41) ; condylobasal length of skull (teeth not worn). 

 44.1 ; zygomatic breadth, 28.1 ; interorbital breadth, 16.0; nasal. [4.3 ; 

 diastema, 11.0; mandible, 30.4; maxillary toothrow (alveoli), 8.9; 

 mandibular toothrow (alveoli), 8.9. 



Specimens examined. — Sixty-three, from the following localities 

 in Dutch Southeast Borneo: Batu Panggol, 22: Birang River, 7; 

 Mahakam River, north bank 13, south bank 11 ; Karong Tigau, 10. 



Remarks. — The differences between the 63 specimens of this form 

 and 30 skins of true dulitensis may be tabulated as follows: 



35 dilutus show obviously more white on underparts than any dulitensis. 



10 dilutus without noticeable white are paler than the palest dulitensis. 



18 dilutus are similar to palest examples of dulitensis. 



10 dulitensis are similar to brightest examples of dilutus. 



20 dulitensis are brighter than brightest examples of dilutus. 



On comparing the 10 dulitensis and 18 dilutus which are essentially 

 similar it is seen -that few if any individuals in either series can be 

 exactly matched by skins from the other. In true dulitensis the red 

 tends toward orange, while in dilutus it is more ochraceous. It 

 would, however, be impossible to sort out the two lots with any de- 

 gree of certainty if the skins were thrown together without labels. 



SCIURUS ATRICAPILLUS ATROX, new subspecies 



Type. — Adult female (skin and skull), No. 19669, United Stales 

 National Museum. Collected on Talisaian Mountain. Dutch South- 

 east Borneo, Feburary 6, 1913, by H. C. Raven. Original No. 457. 

 Presented by Dr. W. L. Abbott. 



Diagnosis. — Like Sciurus atricapillus atricapillus from southern 

 Borneo, but dark area on face not extending behind eyes, and feel a 

 grizzled blackish brown instead of clear black. 



