406 Mr. O. Thomas on a Third Species of Nyctophilus. 
had so much shorter ears than UN. témorensis as to have no 
general resemblance to Plecotus; and I now have to describe 
a third species with ears smaller still, so small, in fact, as to 
be not longer than those of average species of Vesperugo. 
In other respects the new species is absolutely a Nyctophilus 
and shows no approach to other Vespertilionine genera; so 
that the long ears of N. témorensis may be presumed to be 
a later development within the genus, and, judging by the 
abundance and 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 whose exertions 
the National Museum is indebted for very large collections in 
various branches of natural history, and in whose honour I 
propose to name it 
Nyctophilus Walkeri, sp. n. 
Allied to N. microtis, Thos., but considerably smaller and 
with smaller ears; these, when laid forwards, do not quite 
reach to the nose-leaf; they are, however, connected across 
the forehead by a band about 2 millim. in depth, and in this 
respect resemble those of NV. timorensis; besides being 
shorter they are decidedly narrower than those of N. 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 
N. 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 N. timorensis. 
Other characters apparently as in N. 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 5°5; calcar 12. 
Tip to tip of upper canines 3°4. 
Hab. Adelaide River, Northern Territory, Australia. 
