NO. 1976. 



TREE8IIREWS: FAMILY TUP AIID2E— LYON. 



153 



between the largest, T. tana hesara, and the smallest members of the 

 tana group. The fii-st and second upper molars of T. dorsalis are 

 more quadrate in outline than they are in the tana group and have 

 relatively better developed hypocones; the last upper molar is rela- 

 tively larger and with a better developed metacone, and the hypocone 

 of 'pm^ is better developed, resembling that of pm'^ on a small scale. 

 (Plate 11, fig. 1.) 



Measurements. — Usual measurements of adults: Head and body, 

 175-200 mm.; tail, 140-150; hindfoot, 42-45; condylo-basal length, 

 45-46.5; zygomatic wddth, 22-24; width of brain case, 18-19; maxU- 

 lary toothrow, 17-18. See table below. 



Remarks. — Tana dorsalis is one of the best marked forms in the 

 subfamily Tupaiinfe, and needs no comparison with any other species. 

 It is so different from the members of the tana group in the genus 

 Tana that it might almost be made the type of a distinct subgenus, 

 mainly on the basis of the small size of the claws, as well as upon the 

 tooth differences, but the latter are relatively slight. Nothing 

 appears to be published regarding its habits, but judged by the struc- 

 ture of its feet, it probably leads a rather different life than does the 

 tana group. 



Its association with the long-snouted treeshrews was pointed out 

 by Jcntinkin 1890.^ 



Specimens examined. — Fifteen, from various localities in western 

 and northern Borneo. 



Measurements of Tana dorsalis. 



1 Notes Leyden Museum, vol. 12, 1890, p. 228. 

 * dpm* still" in plaoc. 

 » Skulls in the skins. 



* dii and di^ stfll in place. 

 » m' halfway through. 



