142 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 45. 



Slcull and teeth. — These appear to be a trifle larger in this subspecies 

 than they do in T. tana tana, but the difference is so slight as to be 

 practically negligible. 



Measurements. — Type: Hind foot, 50 mm.; condylo-basal length, 

 55.5; zygomatic width, 28; width of brain case, 20; maxillary tooth 

 row, 21. Usual measurements of adults: Head and body, 225-240 ; 

 tail, 160-175; hind foot, 47-51; condylo-basal length, 54-57; zygo- 

 matic width, 27-28; width of brain case, 20-21; maxillary tooth row, 

 21-22. For individual measurements see table, page 146. 



Remarks. — The brighter colors of this subspecies, and especially 

 the grayish area on either side of the dorsal stripe, are well-marked 

 characters for T. t. utara. The most characteristically marked speci- 

 mens are from Mount Dulit. A single specimen from Mount Mulu, 

 1,000 feet, British Museum, Reg. No. 94.6.2.1, is larger than the 

 Mount Dulit specimens, is generally ''redder," with narrower and 

 grayer areas on either side of dorsal stripe, has a more anterior exten- 

 sion of hazel color of the sides over the shoulder stripe, the dorsal 

 stripe rather reddish and less black on the lower back. If these 

 characters should prove to be constant in Mount Mulu specimens, they 

 would of course represent another race of Tana tana. The specimens 

 from British North Borneo are provisionally referred to the present 

 race. The material representing them is poor. Three skins from 

 there in the United States National Museum have been so altered 

 in color by pickling fluid that they are of no systematic value 

 whatever. The reddish elements of the pelage have everywhere been 

 turned to brown, and if one were unaware of their altered condition 

 they would appear to be the most distinct of any of the forms in the 

 genus except Tana dorsalis. 



Specimens examined. — Fifteen from the Baram district and nine 

 from elsewhere in northern Borneo. See table, page 146. 



TANA TANA SIRHASSENENSIS (Miller). 

 1901. Tupaia sirhassenensis Miller, Proc. Wash. Acad. Sci., vol. 3, p. 133, March 

 26, 1901. 

 Type-locality. — Sirhassen, Natuna Islands. 



Type-specimen. — In United States National Museum, Cat. No. 

 104712, skin and skull of adult male, collected on Sirhassen, Natuna 

 Islands, June 5, 1900, by Dr. W. L. Abbott; original number, 442. 



Geographic distribution. — Sirhassen Island. See No. 7 on map on 

 page 143. 



Diagnosis. — Slightly smaller than either Tana tana tana or T. t. 

 utara and rather intermediate in color between the two but more 

 like the form from northern Borneo, having the same bright color 

 of the sides, shoulders, and tail, but the upper parts in the region of 

 the dorsal stripe duller and approaching the condition found in 

 T. t. tana; in some specimens, including the type, the head, and the 

 light areas on either side of dorsal stripe being quite as dark and 



