FIVE NEW MAMMALS FROM SIAM. 285 



white"; but it lias tlie upper pelage nuicli darker. .S'. castaneus is of 

 a brighter brown above and has the underourfaee mure or less of the 

 same colour as the back though of a paler tint, ver}' different from the 

 whitish-drab of S. ijairdneri. 



4. Sciurus atrodorsalis thai, subsp. nos-. 



Tijpe. Adult teniale (skin and skull). Collected at Haheng, 

 Centi-al Siam, on 23rd Jal}' lOlG by Mr. Mr. K. G. Gairdner. Author's 

 number 2474/C.B.K. 



Characters. Differs from tj'pical atrodorsalis Gray, from Moul- 

 mein, Tenasseriin, in having black vibrissae; head like the body, not 

 red<lish-yellovv : muzzle alone ochraceous and onl)' a ring round the eye 

 and the ears ferruginous. 



Differs from S- a. shanicus llylej', from Goteik, North Shan 

 States,* in developing a large black patch on the back with the hairs 

 black throughout in adults (in a subadult specimen annulated); muzzle 

 and eye-ring brighter; underparts very different from the back, feet 

 blackish, grizzled, darker than the body. 



Differs from S- a. ::iiiiineen$is ( Robinson and Wroughton ) from 

 Cliiengmai, North Siam,t in the presence of a large black dorsal patch 

 and the absence of an}- grizzled median line on the chest and abdomen : 

 also smaller. 



Colour. Above a grizzle of black and warm buff, the latter be- 

 coming whitish on the limbs which are thus duller; median area of 

 back from behind the shoulders to above the base of the tail black ; 

 muzzle pale ochraceous ; a ring round the eye and the ears bright tawny, 

 base of ears at back greyish buffy ; fore and hind-feet blackish, slightly 

 grizzled with buffy-white. Tail annulated bufi" and black, the annida- 

 tions forming distinct broad bands on the distal half except at the tip 

 where the two colours are mingled. Underparts, except the chin and 

 throat which are buffy-grey, burnt sienna to chestnut. 



S2^ccimens examined. Three from the t} pe localitj-. 



Measurements. Skull : greatest length, 50.0 ; condylo-basilar 

 length, 42.2 ; i)alatilar length, 20.0 ; diastema, 11.2 ; upper molar row 



•Jmiuh. |{oiiil):iy Xat. Hist. Soc. XXII, p. 663. 

 t .louru. Ffdorak'J Malay States Mus., VII, p. 91. 



VOL. II, DliC r.'17. 



