On the Bornean Species of the Genus Mus. 449 



the femora piceous beneath \ the prothorax and elytra sparsely 

 ciliate at the sides, and also with scattered, shorter, semierect, 

 yellowish-cinereous hairs, which are serially arranged on the 

 elytra. Head coarsely granulate ; prothorax nearly twice as 

 broad as long, feebly rounded at the sides, slightly narrowed 

 in front, the surface densely covered with small, flattened, 

 subtriangular elevations, these being sometimes absent from 

 a smooth narrow line on the anterior half of the disc ; elytra 

 short-oval, widest about the middle, obliquely narrowed 

 behind, densely covered with small flattened triangular eleva- 

 tions, which are more raised and granular towards the apex ; 

 beneath densely granulate and sparsely pubescent. 



Length 2f-3£, breadth 1|-1| millim. 



Many specimens. Closely allied to the European A. rufus, 

 Luc. ( = 7-ugosus, Rosenh.), but duller, the elytra more 

 obliquely narrowed behind, and with the flattened subtrian- 

 gular elevations much more crowded, becoming tuberculiform 

 towards the apex. 



The other described species of the genus are A. insularis, 

 Reitt., from Corsica, and A. duatatus, Reitt., from 

 Astrachan. 



LVIII. — A Preliminary Revision of the Bornean Species of 

 the Genus Mus. By Oldfield Thomas. 



Considering the great richness in rats and mice which 

 Mr. John Whitehead's exploration of Mount Kina Balu in 

 1888 showed Borneo to possess, no part of the world has 

 until recently been so badly represented by specimens in 

 scientific collections as that island. Happily, however, in 

 1893 and 1894, the British Museum acquired from Mr. A. 

 Everett two large collections of Muridse from Kina Balu and 

 other localities, and it is to these collections that the possibility 

 of making even the present rough revision of the members of 

 this group is clue. Mr. Whitehead was the first discoverer, 

 as it turns out, of the majority of the peculiar Bornean species ; 

 but the absence at the time of lowland specimens for com- 

 parison prevented my recognizing all the new forms when the 

 paper .on his collections was written *. Now, however, that 

 Mr. Everett has obtained examples both from high up and 

 low down on Kina Balu, besides sending good series from 

 Labuan, the Penrisen Hills, Palawan, and elsewhere, while 



* P. Z. S. 1889, p. 228. 



