NEW LEGGADA MICE FROM SI AM. 61 



Type. Adult female (skin and skull) No. 2621/CBK. Col- 

 lected at Me Taw, 1500 ft., Western Siam, 40 miles N. W. of 

 Raheng, on 4th February 1917 by Mr. K. G. Gairdner. Orig. No. 357. 



A second female (2620/CBK) was obtained at the same place 

 on 5th March 1907. Orig. No. 385. It is slightly more buffy above 

 than the type. 



I shall not attempt to describe here the molars of these two 

 specimens : they are not ivory-like, clearly grooved and channelled 

 as in Battus, Mus, etc., but are covered with a sort of translucent 

 enamel which prevents details being clearly seen. 



I am rather doubtful whether a third female with the same 

 history (No. 2619/CBK : Orig. No. 372) is of this form, but until 

 the mice of Siam are better known I leave it here. 



It is rather darker and duller above than the others, being 

 less grizzled with buff (perhaps owing to wear), while the base of 

 the pelage is neutral grey : the hair of the under-parts is a little 

 less spiny and is shorter so that the grey base is slightly more 

 visible. 



The skull is of the same general shape, but the nasals are 

 sharply pointed posteriorly and extend beyond the premaxillaries 

 which are not carried obliquely backwards with them. 



The anteorbital plates are convex, practically perpendicular 

 above the base. 



The palatal foramina are narrowed anteriorly, have their 

 greatest combined breadth behind their mid-length and terminate 

 in line with the alveolar edge of the first molars. 



Toothrows scarcely converging ; the molars are much worn ; 

 but the incisors curve to the same slight degree as the other two : 

 mesopterygoid space narrower. 



Leggada rahengis nov. 

 Characters and colour. Upper pelage spiny, the spines 

 about 7 mm. long with broad black tips mixed with fine hairs tipped 

 with ochraceous, so that the general colour is a dark grizzle of och- 



VOL. IV, NO. 2, 1920. 



