12 ARKIV FÖR ZOOLOGI. BAND 8. NIO 23. 



impossible to state if the main land-form is the typical Sciurus 

 Finlaysoni Horsf. or not. 



However, I hope to soon be able to solve this question. 



11. Sciurus ciiinamomeus Temm. — This beautiful 

 cinnamon-rufous squirrel was very common in all the Northern 

 dry forests visited by the Expedition. During the months 

 of February and March several specimens were generally seen 

 together, and as they never showed any shyness I could 

 observe their habits at a close distance. 



The bright pelage looked very beautiful in the burning 

 sun against the background of the rich vegetation. In the 

 evergreen forests this species was never observed, but it was 

 sometimes noticed in the bamboo-forests on the mountains. 



I never observed any specimens with the tendency of 

 developing a white tail-tip. This stånds in contradiction to 

 what is said by Wrotjghton (Ann. Mag. Nat. Hist. 1908. 

 Ser. 8, vol. II p. 396) that several specimens from the Lyle- 

 collection have a whitish tail-tip. 



Sciurus cinnamomeus Temm. is distinguished from its 

 nearest allied Sciurus ferrugineus Cuv. in the complete ab- 

 sence of the black colour on the feet which is a constant cha- 

 racteristic to the last mentioned species. 



The skull measurements of a specimen (J*) from Den 

 Chai are as follows. 



Geatest length .... • = 54 ?5 mm> 



Length from condylus to gnathion =49,5 » 



Basicranial length = 42 6 » 



Zygomatic breadth = 32,6 » 



Greatest breaclth of brain-case = 24 o » 



Breadth between tips of postorbital processus = 29,1 » 



Least interorbital width = 19 g » 



Breadth between meatus auditiva = 22,5 » 



Length of nasals = 15 3 » 



Greatest breadth of nasals = 7 6 » 



Length of diastema = 13 3 » 



» » upper molar series (alveolar) =10,5 » 



12. Sciurus nox Wroughton. — Wroughton: Ann. 

 & Mag. Nat. Hist. Ser. 8, Vol. II. p. 397. 1908. — This jet- 



