SCIUEUS. 275 



foot does the same, but much more distmctly, being decidedly greyish-black 

 and rufous-grizzled, and is evidently in a transitional stage between the black 

 feet of S. schlegelii and the bright red feet of what appears to me to be the 

 fully mature animal S. prevostii, var. borneoensis, or S. sawarakensis. The under 

 surface of this animal is even more lightly chestnut-red than in the previous 

 specimens, and the annulation of the tail has disappeared, but it is here and there 

 washed with greyish. Two other specimens, one of them referred by Dr. Gray 

 to his >S'. rufogularis^ are states of the pelage intermediate between S. schlegelii 

 and S. erytliromelas^ and have the upper surface of the head, neck, and the back 

 and sides, with the exception of the outside of the thighs, jet black, without any 

 grizzling. The sides of the face and neck, the shoulder, the fore limbs and lower 

 half of the hind hmbs, and all the under parts, are bright chestnut. There is 

 a white line from the shoulder to the groin, becoming grey on the outside of the 

 thighs. The chin is black in one, and on it there is a faint trace of a black lateral 

 line, but these black marks are absent in the other. The tail in both is black, 

 washed with greyish, the tip in the squirrel with the black chin being wholly black. 

 The red of the shoulder passes into yellowish above. 



Another variety has the upper surface of the head and the middle line of the 

 neck and above the shoulders, and the area between the shoulder and the groin, and a 

 narrow space over the lumbar region jet black, also the tail, which is slightly washed 

 with yellowish. The sides of the face and neck, the shoulder and fore limb, and the 

 hind feet and all the under parts, are bright red. The upper portion of the shoulder 

 passes into yellowish, and is more or less continuous with the lateral line which has 

 a distinct, yellowish tinge and expands on the outside of the thigh, which is clear 

 yellow, passing into rufous on the lower part of the leg. The black lateral line is 

 obsolete. In all these squirrels the base of the tail, below and around the vent, 

 remains greyish. 



The squirrels from Borneo and the Celebes lead so perfectly from one into the 

 other and into the brightly-marked adult, the S. sarawakensis, Gray, that it seems 

 clear they are all, as I have already said, only phases of one species. 



Apart altogether from local races, it would appear that, in the young stage, 

 the pelage of this type of sqmrrel is grey ; that this gradually changes into black on 

 the back ; that the rufous of the under parts extends by degrees, more or less, 

 on to the limbs, and spreads upwards on to the sides of the face and neck ; and 

 lastly, that the white lateral line and the grey of the thigh change into yellow, and 

 occasionally the upper surface of the shoulder into yellowish-red, whilst the black 

 lateral line, which is well developed in the grey stage, disappears in the adult. 



SciUEUs (Ehinosciueus) tupaoides. Gray. 



Bhinosciurus tupaoides, Gray, List Mamm. B. M. 1843, p. 195; Ann. and Mag. Nat. Hist. 1867 

 vol. XX. p. 286; Blytli, Journ. As. Soc. Beng. vol. xx. 1851, p. 167, etl855, vol. xxiv. p. 477 • 

 Cat. Mamm. As. Soc. Mus. 1863, p. 108. ' 



