KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 57. N:0 2- 39 



it is very well-marked and about 8 mm. broad. In both my specimens the lower light 

 lateral streak is quite indistinct and very obscurely indicated. Even the upper one is 

 not very prominent and of a buffy colour in the Koon Tan specimen instead of yellowisli 

 white as in the other. 



The underparts are not yellowisli white but greyish white with a faint yellowisli 

 tinge. Both my specimens are slightly larger, measnring from nose to vent 190 & 205 

 mm. respectively against 179 mm. in the type. 



The skulls, however, are practically identical as seen by the following measurements 

 (those in brackets are those of the type as recorded by Thomas. The type was an im- 

 mature female collected at Nan in Northern Siarn). 



$ Koon Tan 7 / 6 1914. $ Chum Poo s / 5 1914. 



Nose to vent 190 mm Xose to vent 205 mm. 



Tail 145 > Tail 150 » 



Hindfoot 40 » Hindfoot 40 > 



Skull measurements. 



Greatest length 48,0 & 48,9 mm. (49,0 mm. 



Condylus to gnathion 45,3 & 46,0 » 



Basicranial length 43,0 & 41,5 



Zygomatic width 25,7 & 25,8 (25,5 mm.) 



Width of brain case 20,0 & 20,0 » 



Length of nasals mesially 14,0 & 13,5 



Greatest breadth of nasals 5,8 & 5,5 » 



Breadth between meatus auditiva — & 19,9 



Least interorbital width 12,3 & 12,0 » 



Diastema 11,7 & 12,0 



Palatilar length 22,0 & 23,0 (23,0 mm.) 



Upper molar series 10,8 & 10,0 



Menetes berdmorei koratensis subsp. n. 



Two specimens of a squirrel belonging to the Menetes berdmorei Group and by me 

 referred to typical Menetes berdmorei Blyth. in my former paper abont the Mammals of 

 Siarn (Arkiv för Zoologi, Band 8 No. 23 p. 15) most certainly belong to an hitherto 

 nndescribed race which I propose to name Menetes berdmorei koratensis. 



During my last Expedition to Siarn I obtained some specimens from different lo- 

 calities in Northern Siarn and between t hese specimens and those obtained at the neigh- 

 bonrhood of Sakerat on the Korat plateau in Eastern Siarn considerable differences are 

 to be seen. In the Northern parts of the country the race described by Thomas under 

 the name of Menetes berdmorei consularis occnrred. 



In his recently pnblished review of the Menetes berdmorei Group (Journ. Bombay Nat. 

 Hist. Soc. vol. 23. No. 1. 1914 p. 23 — 25) Mr. Oldfield Thomas disgussed and described 

 some new geographical races of this squirrel. None of the hitherto known forms exactly 

 matches the specimens in my collection and I have therefore been compelled to describe 

 this race under a new name. 



