MAMMALIA. 



separates the yellow ventral from the grizzled 

 dorsal surface. . . S. phayrei, p. 12. 



g^. Below gray ; during the cold weather the grizzled 

 fur of the back is replaced by brilliant orange. 



S. caniceps, p. 13. 



g*. Below dark chestnut, generally with a patch of 

 brilliant black on the dorsal surface ; probably 

 not seasonal. . . S. atrodorsalis, p. 15. 



g^. Feet, ventral surface and upper surface of the 

 head chestnut. . . . S. sladeni, p. 18. 



g^. Below deep chestnut, above varying from yellow 

 grizzled to almost black ; tail-tip red, black, or 

 same colour as the back. S. erythraeus, p. 15. 



g"^. Below white, cheeks ferrugineous ; tail chestnut 

 below; a white spot behind the ear; head with 

 elongate muzzle resembling S. lokriah. 



S. rufigenis, p. 21. 



cP. Ventral surface marked by five stripes, a central and two 



lateral nearly black, two intermediate yellowish white. 



S. quinquestriatus, p. 21. 



d^. Dorsal surface not grizzled; whole squirrel entirely 

 ferrugineous . , S. ferrugineus, p. 22. 



. Squirrels of small size under eight inches in length without 

 the tail ; always marked with dorsal stripes varying in num- 

 ber ; skull of varying shape and size, with the anterior pre- 

 molar present (except S. layardi). 



h. Median dorsal stripe black. 



J. Larger, about seven inches in length without the tail ; 

 stripes barely reaching from the shoulders to the thighs, 

 5 black and 2 light ones ; skull very long and narrow, 

 175 inches long by i'05 inches across at the widest 

 part S. berdmorei, p. 26, 



j^. Smaller, about five inches in length without the tail ; 

 ears tufted with white tips ; stripes varying in length and 

 distinctness; skull very short and rounded, i'05 long 

 by "85 across the broadest part. 



S. maclellandi, p. 27. 



h^. Median dorsal stripe white or yellow. 



k. Rump and under side of the tail with a distinct tinge of 

 red. 



