SCIUUUS. 247 



A Siam specimen, however, named by Dr. Gray S. ferrugineus, is of considerable 

 interest from the circumstance that the white does not occur at the tip of the 

 tail, but appears as a great white patch a little way beyond its base, whereas 

 in all the other specimens from Siam the tail is concolorous with the body, 

 but slightly paler at its tip. The appearance of the white on tins portion of the tail 

 would seem to indicate that there is an inherent tendency to the production of that 

 colour, probably explicable on the theory of reversion, because the young of many 

 squirrels when born have their tails white, this colour disappearing with age. In 

 connection with this specimen, it is also to be remarked that it is much darker 

 than any of the others from Siam, but not darker than an example from Assam. 

 All the Siam specimens have the feet concolorous with the body, whereas in the 

 Bm^mese squirrels the toes are generally black, also the upper surface of the hind 

 feet more or less so, but in other respects they are ahke, and this slight difference 

 cannot be regarded as more than a local variation, so that the only legitimate course 

 seems to be to consider these uniformly red Siam squirrels as specifically identical 

 with S. ferrugineus, the differences that exist between them not being greater than 

 those which occiu' among the phases of S. caniceps and S. clirysonotus. 



The skulls of typical examples of S. ferrugineim var. keraudrenii, appear to be 

 distinguished by the contracted character of the posterior ends of the nasals. In 

 other respects, however, they do not perceptibly differ from the general characters 

 of such skulls as those of S. pJiayrei, S. hlanfordii, S. caniceps, S. erythrceus, and 

 S. gordoni. 



I have retained the term S. ferrugineus, as it has the sanction of long use and 

 general recognition. 



* SciUBUS LOKROiDES, Hodgson. 



Sciums lokroides, Hodg. Journ. As. Soc. Beng. vol. v. 1836, p. 232 j ibid. vol. x. 1841, p. 91.5; 

 Horsfield, Proc. Zool. Soc. 1839, p. 152; Cat. Mamm. E. Ind. Co.'s Mus. 1851, p. 153; Proc. 

 Zool. Soc. Lond. 1856, p. 402; Ogilby, Royle's 111. Himal. Bot. 1840; Mem. Mamm. p. 13; 

 Wagner, Schreber, Saugeth. Suppl. vol. iii. 1843, p. 202 ; Walker, Cal. Journ. Nat. Hist. vol. iii. 



1843, p. 266 ; Gray, Cat. Mamm. Nepal Mamm. &c. 1846, p. 23; Blyth, Journ. As. Soc. Beng. 

 vol. xvi. 1847, pp. 873, 877; ibid. vol. xviii. 1849, p. 603; ibid. vol. xxiv. 1855, p. 475; Cat. 

 Mamm. As. Soc. Mus. 1863, p. 104; Gray, Ann. and Mag. Nat. Hist, vol xx. 1867, p. 274. 



Sciums locwides, Hodg. Journ. As. Soc. Beng. vol. x. 1841, p. 915; Cal. Journ. Nat. Hist. vol. iv. 



1844, p. 293; Schinz, Syn. Mamm. vol. ii. 1845, p. 35. 



&j«rM« a*M»ie«M-s, M'Clelland, Gray, Hand-List Mamm. B. M. 1843 (in part), p. 143; Ann. and 

 Mag. Nat. Hist. vol. xx. 1867, p. 274; Blyth, Journ. As. Soc. Beng. vol. xvi. 1847, pp. 873, 

 877; ibid. vol. xxiv. 1855, p. 475; Cat. Mamm. As. Soc, Mus. 1863, p. 103; Horsfield, Cat. 

 Mamm. E. Ind. Co.'s Mus. 1851, p. 153. 



Sciurus hlytldi, Tytler, Ann. and Mag. Nat. Hist. 2nd ser. vol. xiv. 1854, p. 172. 



Macroxus similis, Gray, Ann. and Mag. Nat. Hist. vol. xx. 1867, p, 281. 



I have before me sixty-two examples of various squirrels wliich have been 

 referred to S. lokroides, S. assmiensis, and S. blytUi by Hodgson, M'CleUand, and 

 Tytler, also the types of S. similis. Gray, which were forwarded to the British 

 Museum as S. lokroides by Hodgson. After a careful consideration of these materials, 



