AOC) Mr. O. Thomas on a Third Specieft o/'Nyctopliilus. 



liad so much sliorter ears than A^. timorensis as to have no 

 general resemblance to Plecotua ; and I now have to describe 

 a tliird species with ears smaller still, so small, in fact, as to 

 be not longer than those of average species of Vesperugo. 

 Tn other respects the new species is absolutely a Nyctophilus 

 and shows no approach to other Vespertilionine genera ; so 

 that the long ears of N. timorenais may be presumed to be 

 a later development within the genus, and, judging by the 

 abundance ai\d wide distribution of the species, a most 

 successful one. 



The type specimen of the new species was obtained by 

 Mr. J. J. Walker, of H.M.S. ' Penguin,' to who=ie exertions 

 the National Museum is indebted for very large collections in 

 various branches of natural history, and in whose honour 1 

 propose to name it 



Nyctophilus Walkeriy sp. n. 



Allied to A^, microtis, Thos., but considerably smaller and 

 witii smaller ears; these, when laid forwards, do not quite 

 reach to the nose-leaf; tliey are, however, connected across 

 the forehead by a band about 2 millim. in depth, and in this 

 respect resemble those of N. timorensis ; besides being 

 shorter tliey are decidedly narrower than those of X. microtis, 

 and their inner margin is much less convex ; the small lobe 

 on the inner surface of the base of the outer margin is, as in 

 A^. microtis, short and well defined, instead of being long and 

 passing gradually at each end into the main outer margin, as 

 is the case in A^. timorensis. 



Other characters apparently as in A^. microtis, except that 

 the teeth are smaller and weaker in proportion, and the fur is 

 shorter and paler in colour, especially on the under surface, 

 where the hairs are tipped with dirty white. 



Dimensions of the type (an adult female in alcohol) : — 



Head and body 45 millim.; tail 36; ear, length above 

 crown 10'5, breadth 9*5 ; tragus, length of internal margin 

 4'3 ; forearm 33"5 ; lower leg 15 ; hind foot Oi) ; calcar 12. 

 Tip to tip of upper canines '6'\. 



Hab. Adelaide River, Northern Territory, Australia. 



