FIVE NEW MAMMALS FROM SIAM. 287 



Soutlierii Siaui, liaving tlie iiiaininaiy formula of tlie former with tlie 

 skull of tlio latter. 



I have seen four of the type series of sladeni belonging to the 

 Indian Museum : they are preserved in alcohol and now useless as re- 

 gards colour which, however, was said to have been reddish-brown 

 above and yellowish-white below (/,ool. Res. in Yunnan, 1878, p. 305)- 

 The skulls are very like the present animal's but the bullae are smaller: 

 three of the specimens are females and the mammae in two are 3-3= 12 J 

 but in tlie thii'd, one of the pector.d pairs is absent. 



I have also seen three of the type series of Rattus; yunnancnsis 

 (Anderson) from the same district: the mammae of the only female 

 are also 3-3=12 and the skulls so closelj' agree with those of sladeni 

 that they are probably of the same race though thej- certainly appear 

 to have the smaller external dimensions shown by Anderson, 



VOL II, nF.r. r.117. 



