MAMMALS FROM SIAM. 47 



SO regular throughout in tlie series of sixteen as to render it an 

 extremely distinct race, even though, as recorded above, animals 

 from Lem Ngop (the nearest point of the mainland), having 

 indications of grizzling on the thighs, tend to connect it with 

 the more typical chinamomeus animal. It is named after 

 Captain H. 1j. Frandsen, R.N.R., Denmark, to whom I am 

 indebted for much assistance and interesting information while 

 in S.E. Siam. 



20. SCIURUS ALBIVEXILDI, sp. n. 



Type. Adult male (skin and skull). No. 1724/C.B.K. B.M. 

 No. '15.11.4.46. Collected on Koh Kut Id., S.E. Siam, 25th 

 December, 1914. 



Chciracters and Colour. — Black throughout except the extremity 

 of the tail, which is white. 



Skull and Teeth. — As in S. cinnamomeus. 



Measurements. — Type : Ear, 20'5 mni. Skull : basilar length, 

 436 ; brain-case breadth, 25'2 ; proximal breadth of nasals, 7 ; 

 distal breadth of nasals, 4"4. Ears of the series, 19-21*5. For 

 other measurements see table, p. 70. 



Specimens examined. — Twenty-three, 12 males and 11 females, 

 all from the type-locality. 



Remarks. — -S. albivexilli is somewhat variable in respect of the 

 white tail-tip. In some animals the last 3 to 4 inches of the tail 

 are white, and there is a white ring close to the bases of the haii'S 

 for the distal three-fourths of the tail ; in othei's there are no 

 annulations, and the pale tip is reduced to a bunch of greyish 

 hairs at tlie extreme end. 



Two other forms of Black Squirrel occur in Indo-China : S. nox 

 Wroughton (Ann. & Mag. Nat. Hist. ser. 8, vol. ii. p. 397, 1908), 

 in the neiglibourhood of Siracha, on the eastern shore of the 

 Inner Gulf near Bangkok, a,nd S. f/ermaini Milne-Edwards (Rev. 

 Zool. 1867, p. 193) on Pulo Condor, south-east coast of Cochin- 

 China t both are black thi-oughout, but the latter is much smaller 

 than the other. On distributional grounds it seems impossible 

 to treat them and the present form as local races of one species, 

 as there is no geographical coniiection, the mainland eveiy- 

 where in the vicinity of Koh Kut being occupied by the red 

 S. cinnamomeus. 



The latter is, however, known to develop a white tail-tip, and 

 it is possible that through S.f. frandseni, with its black-tipped 

 upper pelage, blackish fore limbs and thighs, a connection may be 

 traced between the Koh Kut animal and S. cinnavwmeus. It is, 

 however, very slight. 



21. Tamiops rodolphi M.-E. 



Scit(,7-ios rodolphi Milne-Edwards, Rev. et Mag. de Zool. xix. 

 p. 227 (1867) ; id., Rech. Mamm. 1871, p. 162 ; de Pousargues, 

 Mission Pavie, Indo-Chine, Etudes Diverses, iii. p. 528 (1904). 



