On new Mammals from Dutch flew Guinea. 205 



XXIII. — On new Mammals obtained by the Utahwa Expe- 

 dition to Dutch New Guinea. By Oldfield Thomas. 



(Published by permission of the Trustees of the British Museum.) 



The British Museum owes to the organisers of Dr. A. F. R. 

 Wollaston's recent expedition, via the Utakwa River, to the 

 snow mountains of the Charles Louis Range, Dutch New 

 Guinea, the considerable series of mammals obtained during 

 the expedition. Mr. C. B. Kloss, already so well known as 

 a mammal collector in the Malay Peninsula and islands, was 

 in charge of the collecting work and it was hoped that a 

 really large series of different forms would have been obtained. 

 But the difficulties in the way of collecting, especially the 

 entire unsuitability of the natives to give any help, prevented 

 any number of the interesting arboreal forms being obtained, 

 amongst which novelties are most to be looked for. On the 

 other hand, thanks to the industry of Mr. Kloss and his 

 Dyak trappers, a very good seiies of terrestrial species was 

 obtained, notably a particularly good set of the genus 

 Uromys, which is represented by no less than six species, 

 three of them being new. In all, the collection consists of 

 about 150 specimens, which form a very valuable and 

 acceptable addition to the British Museum's material from 

 that still little-known island New Guinea. 



Hipposideros icollastoni, sp. n. 



Near II. muscinus, but with a doubled posterior nose-leaf 

 and more inflated muzzle to the skull. 



General external characters approximately as in muscinus, 

 with the one important exception that the posterior nose-leaf 

 has behind it a peculiar duplication developed to an extent 

 unlike anything hitherto known in the genus. This dupli- 

 cation consists of a transverse crest growing out at the back 

 of and parallel with the main crest, the groove between the 

 main and supplementary crests being subdivided into three 

 cells by two longitudinal connecting-bands. In II. muscinus 

 there are merely some inconspicuous warts or convexities in 

 the position of the complicated and definite structure now 

 described. Its nearest analogue is found in the African 

 H. caffer, where there is a less developed supplementary 

 crest, but no trace of the longitudinal connecting-bands. 

 Ears of the comparatively broad shape distinguishing II. 

 muscinus from the allied Australian species H. semoni and 

 stenotis. 



