32 



NILS GYLDENSTOLPE, THE SWEDTSH ZOOLOGICAL EXPEDITIONS TO SIAM. 



The type of this species originally was described from Burma but it also 

 occurs in Northern »Siarn. It is very similar to Ratuja mélanopepla peninsuloe, Miller, 

 from the southern parts of the Malay Peninsula, but may always be distinguished 

 by its larger size. In Northern Siarn another member of the Group the Ratuja gigantea 

 Mc Clell. is also said to occur (vide Wroughton, Journ. Bombay Nat. Hist. Soc., vol. 

 19, 1910 p. 890). This latter form is characterized by its large size and by havingtufted 

 ears. During my journey I, however, ne ver met with this form, which therefore seems 

 to be very rare. 



Skull rneasurements 



(Jreatest length 7(3, S mm. 



Condylus to gnathion 70,5 » 



Basicranial length 66,2 » 



Zygomatic vviclth 48;0 » 



Width of brain case 32,5 » 



Least interorbital breadth 31 ,0 » 



Least postorbital breadth 24,0 



Mastoid width 32,5 » 



Length of nasals mesially 24,0 » 



Breadth of nasals anteriorly .... 13,0 > 



Breadth of nasals posteriorly .... 8,5 » 



Diastema 15,0 



Palatal length from henselion . . . 28,0 > 



Length of upper molar series .... 15,3 » 



70,8 mm. 



71,5 » 



47, G » 

 32,0 

 32,0 



25,0 » 



33,0 » 



25,5 » 



13.4 f 



10,3 » 



15.0 » 



27.1 » 



14.5 » 



75,0 mm. 



40,0 

 32,5 

 31,2 

 25,0 

 32,0 

 23,2 

 13,1 

 7,5 

 15,2 

 27,0 

 15,2 



74.0 mm. 



67.1 » 

 62,0 » 

 45,5 » 

 32,5 » 

 29,5 » 

 25,0 » 

 31,7 » 

 22,0 » 



13.2 » 

 7,2 » 



15,5 » 



27,0 » 



15,0 » 



74,0 mm. 



68,0 » 



63,0 » 



44,0 » 



32,0 » 



29,0 » 



24,3 » 



32,0 > 



23,0 » 



12,8 » 



7,5 . 



15.0 » 



27.1 » 

 15,1 » 



Still another form has recently been obtained in South-eastern Siarn by Mr. C. 

 Boden Kloss and described by him under the name of Ratuja mélanopepla leucogenys. 

 (Proc. Zool. Soc. London 1916 p. 43.) This race is said to be nearest to that one of the 

 Malay Peninsula viz. Ratuja mélanopepla peninsuloe, Miller, but may be distinguished 

 by its påle yellow colouration and by having a large yellow patch on the hindfoot. The 

 yellow of the före limb is greater in extent and reaches to the base of the toes. As sug- 

 gested by Boden Kloss (tom. cit. p. 43) the specimen obtained by me at Sakerat 1912 

 and recorded under the name of Ratuja mélanopepla, Miller (Arkiv för Zoologi, Band 8. 

 N:o 23. p. 15. 1914) belongs to this form and possesses all the characteristics pointed 

 out by Kloss. 



Sciurus castaneoventris gordoni. Anders. 



J 1 Doi Par Sakeng, Northwestern Siain, "/t 1914. — Nose to vent — 215 mm.; tail = 195 mm.; hindfoot 

 = 50,5 mm. $ Doi Par Sakeng 28 /c 1914. — Nose to vent = 217 mm.; tail = 215 mm.; hindfoot = 



51 mm. - - $ Doi Par Sakeng 18 /t 1914. — Hindfoot = 51 mm. — $ Ban Meh Na, Northwestern Siarn, 21 /.; 

 1914. - - Nose to vent = 200 mm.; tail = 200 mm.; hindfoot = 51 mm. — 9 Ban Meh Na -'/,; 1914. - 

 Nose to vent = 195 mm.; tail = 210 mm.: hindfoot = 50,5 mm. 



The whole series is very uniform as to the colouration. In the specimens collected 

 in June the underparts of the body are darker and almost chestnut, while in the specimens 



