34 GYLDENSTOLPE, ON A COLLECTION OF MAMMALS MADE IN EASTERN AND CENTRAL BORNEO. 



cimen (original number 67), however, which most certainly is young, the black dorsal 

 area, so conspicuous in the other fullgrown specimens, is ill-defined. In another 

 yonng specimen (orig. number 77) many of the hairs of the tail have the ochraceous 

 bases very broad, which gives the tail an almost banded appearance, as some of the 

 hairs also have rufous tips. In specimen No. 66, though quite fullgrown, the tail 

 is exactly like that of specimen 77. In the type specimen of R. ephippium bara- 

 ?nensis the hindfoot measures 70 mm. but in the present series it varies between 

 69 and 82 mm. 



From Sandakan in British North Borneo another allied form has been described 

 by Bonhote under the name of R. ephippium sandakanensis. This subspecies is said 

 to be near to R. ephippium baramensis, but differs in having »the hairs on the back 

 black not brovvn, with yellowish-white subterminal annulations instead of rufous. 

 These annulations are absent along the centre of the back, thus forming a dark 

 median dorsal stripe which starts between the shoulders and runs to the root of the 

 tail. The feet, inner sides of limbs and underparts are dirty yellowish white, and 

 on the cheeks is a small patch of ferruginous. » 



As Mr. Lumholtz specimens were all collected some distance south of Sandakan 

 they would most probably have belonged to this latter form if it is really distinct. 

 The pelage of Squirrels all undergo certain differences according to the season, and 

 it seems the present author highly possible that R. e. sandakanensis is only based 

 upon seasonal variation and has to be surpressed as a subspecies. 



29. Ratufa ephippium cothurnata Lyon. 



Proc. U. S. Nat. Mus., Vol. 40, 1911, p. 93. 

 Toembang Maroewe, Central Borneo, Okt. 1915. 



Skull measurements : Greatest length: 66,7; condylus to gnathion: 59,5; basi- 

 cranial length: 55, 1; zygomatic width: 40, 0; greatest width of brain case: 29,o; least 

 interorbital width: 25,o; length of nasals mesially: 22,0; breadth of combined nasals 

 anteriorly: 12,5; breadth of combined nasals posteriorly : 10,i diastema: 14,8; maxillaty 

 toothrow: 12,2; palate from henselion: 26,o; least postorbital width: 22,o; mastoid 

 breadth: 29, 1 mm. 



This single specimen agrees fairly well with the original description of R. 

 cothurnata 1 as given by Lyon (tom. cit.). It differs from its nearest ally R. ephip- 

 pium baramensis Bonh. by having the thighs concolor with the underparts of the 

 body. R. ephippium cothurnata is probably a mountain species, though found in the 

 interiör parts of the Island, while R. e. baramensis is a low-land form. 



1 Type locality: Mount Palung near Sukadana, W. Borneo. 



