158 JOURJVAL, NATURAL HIST. SOCIETY OF SIAM Vol. L 



This view of the case is much more satisfactory than the opinion 

 lield by recent workers, for the type of the Jinlayso7ii group will then 

 be one of the mainland animals and not a degenerate island form, 

 which on account of its small size and rather yellower colour, require.- 

 a separate name and may be known as : — 



Sciurus finlaysoni portus. 



Scitu'us ji'iihiiiHoni, Anderson, loc. cit. supra : Flower (partim) 

 /'. /. S. 1900, p. 355 : Wroughton, Ann. and Mag. Nai. Hist., ser. 8, 

 vol. n, p. 398 (1908) ; C4yldenstolpe (partim) Arlnr fnr Zonlogi, Band 

 8, no. 23, p. 11(1911). 



Type. Adult male (skin and skull) No. 1938/CBK. Collected on 

 Koh Si Chang, Inner (tuU' of Siam, 26th January, 1915. 



Characters. Like S. finlaysoni finhtysoni of the Siamese mainland 

 1)ut smaller and rather yellower, 



Colour. Ivory yellow thronghout, most intense on the up])er 

 surface and tail; but paler, almost white, on sides of iiead, chin and 

 forelimbs. Skins of nostrils, lip, ears, soles of both feet, genitals black. 

 H]yes black. Vibrissae black, 



Measv/reraents. Ear 17.5* Skull: basilar length 36.5, ])raincase 

 breadth 21.7, proximal breadth of nasals 3.3, distal breadth of nasals 

 i].^. For other measurements see table \). 161. Ears of the series 

 17 — 19 mm. 



Specviiiens exwmined . Twenty -seven ; fifteen males and twelve 

 females, all from the type locality. 



Remarks. I found (S. /'. porius very common on Koh Si Chang 

 and very fearless. Its small size is due to its insular habitat and to 

 the poverty of the vegetation, large scrub rather than forest, witli 

 which the island is covered. It runs busily about the stems and 

 branches, often almost descending to the ground, in its search for food. 

 The pelage of many of the animals obtained is considerably abraded 

 and in every cd^e has a stick}'" feeling ver}'^ different from the smooth 

 o-lossy hair of other s<|uirrels, while Imth as skins and in the flesh a 

 peculiar characteristic odour attaches to them. 



In the series a number of animals have black vibrissae like tlie 

 type, in an equal number the vibrissae are pure white, while some have 



*A]1 iiie;i:«ureii)onts in iiiilliiiietro> 



