40 \1I.S &YLDENSTOLPE, THE SWEDISH ZOOI.OG1CAJ. EXPEDITIONS Tu SIAM. 



Tlie new race, which probably only inhabits the Eastern parts of Siain and the 

 adjoining parts of Tonkin may chiefly be characterized by its small hindfoot and its 

 short muzzle. The general colouration is also somewhat different, but as these squirrels 

 like other Oriental squirrels have different seasonal pelages I don' t t hink t hat the colou- 

 ration of the fur is of any great value in the separation of geographical races. 



As compared with specimens of Menetes berdmorei consularis Thos. the mainpoint 

 of difference lies in the colouration of the lower surface of the body. In the new form 

 the underparts of the body are almost pure white on the anterior parts, then followed 

 by an area where only a narrow part in the middle of the abdomen is white. The white 

 colour is bordered on each side by a blackish line which reaches as far as to the lowest 

 of the lateral stripes. The hindmost part of the abdomen is white slightly washed with 

 ochraceous. There is no median dorsal black stripe. The light stripes on the sides of 

 the body are verv conspicuous and of a yellowish buff colour. Between these two light 

 stripes the pelage is of exactly the same colour as on the upper parts of the body and not 

 darker as in Menetes berdmorei consularis Thos. 



Type: Adult male collected at Sakerat in Eastern Siarn on the 9th of January 

 1912. Hindfoot (measured in skin) = 36 mm. 



Skull measurements. ' 



Greatest length 46,1 mm. 



Basicranial longth • 41,7 



Length from condylus to gnathion 44,1 



Zygomatic width 25,4 (24,4 mm.) 



Greatest width of brain case 20,3 (19,8 



Lengt of nasals mesially 13,7 » (,1 3.1 



Least interorbital width 11,8 11,9 



Least postorbital width 14,0 (14,4 ) 



Diastema 12.0 ,11,1 » ) 



Palate to henselion 22,7 (21,7 < ) 



Distance betweeen lacrymal notch to tip of nasals . . 19,0 » (18,5 » ) 



Maxillary toothrow 9,2 ( 9,1 » ) 



Length of frontals mesially 20,1 (20,0 



Length of bulla; 9,2 (9,1 



Breadth of bullse to meatus auditiva 5,0 ( 4,9 » ) 



South-eastern Siarn is inhabited by still another form Menetes berdmorei mouhoti, 

 Gray, the hind-foot of which measnres 41 — 45 mm. 



Tamiops macclellandi kongensis. Bonh. 



J 1 Pak Koh l8 /'s 191 J. Hindfoot mearsured in skin; = 30 mm. — $ Koon Tan, '/st 1914. — 



Nose to vent = 115 mm.; tail = 119 mm. — ^ Koou Tan % 1914. — Nose to vent = 140 mm.; tail = 

 139 mm.; hindfoot (measured in skin) = 31 mm. — $ Koon Tan ls /o 1914. — Nose to vent = 110 mm.; 

 tail = 129 mm.; hindfoot (measured in skin) = 31 mm. — J 1 Clium Poo 8 /s 1914. — Hindfoot (measured 

 in skin) = 30 mm. — $ Chum Poo 3 /» 1914. — Hindfoot (measured in skin) —■ 30 mm. 



A fines series of this small squirrel was obtained at different localities and seasons 

 during my travels in Northern Siarn 1914. 



1 Measurements in brackets are tliose of an adult female obtained at the same locality as the type. 



