36 



NILS GYLDENSTOLPE, THE SWEDISH ZOOLOGICAL EXPEDITIONS TO SIAM. 



Like other Oriental Squirrels this species seems to be very variable, especially as 

 concerns the colour of the underparts of the body. The rufous colour generally seems 

 to mingle into orange. In the female shot at Koh Lak on the 26th of November the un- 

 derparts are almost chestnut and of about the same colour as the lower surface in Sciurus 

 castaneoventris gordoni Anders. The black dorsal area is only faintly visible, most clearly 

 in the specimen from Hue Sai. 



A near ally to Sciurus atrodorsalis is Sciurus rubeculus described by Miller on 

 specimens from Träng in Peninsular Siarn. According to Miller his Sciurus rubeculus 

 is clearly distinguished from true S. atrodorsalis by its greater size. The frontals are 

 also nearly flat and not concave as in S. atrodorsalis. 



Miller (Smithsonian Misc. Coll. vol. 45. 1903 p. 22) gives the median length of 

 the nasals in an adult female of S. atrodorsalis from Kokareet in Tenasserim to 14,6 mm. 

 None of my specimens have the nasals longer than 14,5 mm. and that is a male. Another 

 old male in my collection has the nasals only measuring 12,9 mm. 



Robinson & Kloss have recently described (Ann. Mag. Nat. Hist. ser. 8 vol. 13. 

 1914 p. 224) a species from the mountain regions of the southern two-thirds of the Malay 

 Peninsula under the name of Sciurus erythrosus youngi. This species is said to be closely 

 allied to Sciurus rubeculus Miller though »somewhat smaller and duller in colour, the 

 head and tail lacking the golden-orange suf fusion so conspicuous in that race». 



Measurements 



9 



Nose to ven t 205 



Tail 180 



Skull: greatest length 49,7 



condylus to gnathion .... 44,0 



7,3'gomatic width 27,5 



interorbital width 16,2 



postorbital width 



width of brain case 22,5 



length of nasals mesially . . 14,5 



breadth of nasals anteriorly . 6,1 



breadth of nasals posteriorly . 3,0 



diastema 10,0 



palate to henselion 20,2 



length of incisive foramina . 3,0 



length of iipper molar series . 10,0 



165 ram. 



207 ram. 



190 mm. 



235 



205 



152 » 



195 



185 



— 



— 



50,4 



52,1 



— 



— 



45,5 



47,1 



29,5 » 



28,0 » 



29,2 » 



30,2 



18,0 » 



16,1 



17,0 



18,8 



— 



17,2 



18,0 



18,5 



— 



22 1 



22 7 



23,0 



14,1 » 



13,0 



13,2 



12,9 



6,0 » 



6,2 



6,5 » 



7,0 



2,5 » 



3,0 



3,0 



3,0 



10,4 » 



10,0 



10,0 



11,0 



— 



20,1 



20,3 



2!,o 



3,0 



2,5 



3,7 



2,9 



10,1 » 



9,0 » 



10.1 



9,9 



Sciurus ferrugineus cinnamomeus. 



£ Pak Koh, Northern Siarn, t5 /s 1914. — Hindfoot = 53 ram. 

 250 mm.: hindfoot = 53 mm. 



Temm. 



- ef Pak Koh 14 / 4 1914. — Tail 



When working out the Squirrels belonging to the difficult finlaysoni-Grou^ I have 

 come to the conclusion that the Burmese Sciurus ferrugineus Cuv. and the Siamese Sci- 

 urus cinnamomeus Temm. are not worthy of being given a specific name, but are only to 



