SCIURUS. 5 



The key is more or less an artificial one and must not be taken 

 as exhibiting the real affinities of the different species. 



Key of the hidian Species. 



a Squirrels of large size ; length without tail more than r 2 inch- 

 es ; skull over two inches in length ; the anterior upper pre- 

 molar constantly absent. 



b. Black or dark-brown above, yellow below; outside of the 

 shoulders and thighs, legs and feet constantly of the same 

 colour as the back. 



c. Ears not tufted . . . . S. bicolor, p. 7. 



c^. Ears tufted . . . S. giganteus, p. 8. 



b"^. Above red and black, with a yellow occipital patch; feet 

 yellow like the under surface ; ears very fully tufted. 



S. indicus, p. 10. 



b^. Above black or grizzled black and white, a yellow or white 

 occipital patch ; feet black, but the outside of the limbs 

 yellow like the under surface ; ears very slightly tufted. 



S. macrourus, p. 11. 



a^. Squirrels of medium size, less than 12 inches in length 

 without the tail ; never dorsally striped ; skull i"6 to i*8 inches 

 in length ; the anterior upper premolar always present. 



d. Dorsal surface grizzled, either gray, yellow or red and 

 black ; no ventral stripes, 



e. Slightly smaller skull, averaging i*6 inch. 



/. With a black tip to the tail ; ventral surface pa^e. 



S. pygerjrthrus, p. 11. 



f^. Tail-tip not black ; ventral surface pale ; a bright red 



patch frequently present on the thighs (seasonal .?) 



S. lokroides, p. 18. 



/^ Tail-tip not black; ventral surface bright orange ; a 

 white patch of hairs behind the ear ; head with a 

 somewhat elongated muzzle compared with S. 

 lokroides. . . . S. lokriah, p. 20. 



e^. Skull somewhat larger, from 1*85 to ro inches in 

 length. 



g. Tail-tip black ; feet yellow ; below orange. 



S. blanfordi, p. 12. 



^ Tail-tip black ; feet yellow ; a black lateral patch 



