KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 57. NIO 2- 



19 



Skull measurements 



C? 



Length of nasals . 

 Interorbital breadth 

 Maxillary toothrow 



15,2 

 13,9 

 17,0 



cT 



Greatest length 49,0 mm. 



Condylobasal length 47,0 



Basilar length 44,5 



Zygomatic width 25,0 » 



Width of brain case 18,3 > 



Palatal length i 25,7 



25,4 

 19,5 

 24,8 

 14,7 

 13,8 

 18,0 



Tupaia belangeri laotum. Thos. 



Ann. Mag. Nat. Hist. ser. 8, vol. 13. 1914 p. 244. 



$ Koon Tan 16 /s 1914. — Nose to vent = 175 mm.; tail = 173 mm.; hindfoot = 

 Koon Tan 19 /o 1914. — Nose to vent = 170 mm.; tail = 170 mm.: hindfoot = 41,5 mm. 



41 mm. — 1 ad. 



In a paper »On the Tree Shews of the Tupaia belangeri-chinensis Group » Mr. Old- 

 field Thomas also describes a new subspecies of a Tupaia obtained at Nan in North- 

 eastern Siarn under the name of Tupaia belangeri laotum. 



In the description Mr. Thomas remarks that the »general colour is rufous brown» 

 and quotes »Brussels brown» of Ridgway as being nearest. That colour also agrees 

 fairly well with one of the specimens in my collection viz. that one obtained at Koon 

 Tan on the 16th of May. Especially the colour on the flanks matches it very well in- 

 deed. The rump in that specimen is also decidedly darker than the upper back but 

 blackish brown instead of blackish grey as stated by Thomas. 



The other specimen seems to be a younger individual and its general colouration 

 is much darker. The dark colour on the rump is not so well-marked as in the other spe- 

 cimen. 



The skulls resemble those of true belangeri much more than those of chinensis and 

 I therefore believe that Thomas is quite right that this form ought to be considered as 

 a subspecies of belangeri rather than of chinensis. 



In the specimen obtained in May the lower parts of the hindlimbs are greyish white 

 and the underparts of the body påle buff. 



This species seems to be generally distributed över the whole of Northern Siarn, 

 though it was not very abundant at the localities visited by the Expedition. Both my 

 specimens were obtained at an altitude of about 1200 m. 



