N. GYLDENSTOLPE, MAMMALS COLLECTED IN SIAM. 11 



ever. according to Bonhote (Ann. & Mag. Nat. Hist. Ser. 7. 

 Vol. 7. 1901 p. 271.) always distinguished by »the annulations 

 on the hairs of the back being of varying degrees of ferru- 

 ginous, instead of påle ashy. The hairs on the ears are 

 also rufous, which is never the case with those in Se. cani- 

 ceps.» 



In Siarn this species was only common in the bamboo- 

 forests in the North and seemed to live in rather high alti- 

 tudes. In the bamboo-forests on the Korat plateau in 

 Eastern Siarn it was never observed. 



Skull measurements of a specimen from Kao Plyng: 



Lengtk from condylus to gnathion =54,2 mm. 



Basicranial length = 47, o » 



Greatest zygomatic breadth = 32,4 » 



» breadth of brain-case = 26, o » 



Length of nasals = 17,9 » 



Greatest breadth of nasals = 7,2 » 



Breadth between meatus auditorms = 22,3 » 



Breadth of bulla to meatus auditorius = 5,9 » 



Least interorbital breadth = 19,3 » 



Distance between tips of postorbital processus . . . . — 27,5 » 



Length of diastema — H,ö » 



upper molar series (alveolar) =11,4 » 



» » 



10. Sciurus Fiiilaysoni Horsf. — The white variety 

 of this squirrel was only observed in the dry laterite forests 

 on the Korat plateau, and on the island of Koh-Si-Chang at 

 the mouth of the Menam Chao Phaya river. This species 

 was generally very shy and härd to approach in the tangle 

 of the rich vegetation. 



The form inhabiting Koh-Si-Chang seemed to be smaller 

 and of a more yellowish-white colour. The eyes are black, 

 and the soles of the feet are of the same colour, according 

 to a mounted specimen seen on the island. Unfortunately 

 I did not get any specimens from this locality, but S. S. 

 Flower in his paper »On the mammalia of Siarn and the 

 -Malay Peninsula» (Proc. Zool. Soc. 1900, N:o XXII. p. 356) 

 believes the Koh-Si-Chang form to be smaller than the main- 

 land one, and perhaps of a small island-race. I think he is 

 quite right, but the lack of material makes it, for the present, 



