382 Zoological Society : — 



a good number of their crania, I became convinced that they were 

 all specifically distinct. 



The shape of the head, face and ears docs not differ materially 

 from that of the same parts in the two preceding species ; the only 

 perceptible difference beyond that of size being in the somewhat 

 greater elevation of the top of the head. As in A'. Timoriensis, the 

 ears are strongly sulcated, and it bears a general resemblance to that 

 species in the quality and colouring of the fur. 



The fur of the whole of the upper parts is very distinctly bico- 

 loured : it might almost be called tricoloured ; the basal half greyish- 

 black, and the terminal half grey-brown, with the tips browner. On 

 the rump the brown colour is rather more conspicuous than on the 

 fore part of the back. The basal part of the upper surface of the 

 interfemoral membrane is a little hairy in some specimens, but in 

 others this is not observable. 



On the whole of the under-surface the fur is strongly bicolonred, 

 nearly black at the base, with the terminal third huffy grey. On 

 the pubes the dark colour at the base of the fur is reduced to a small 

 quantity, and it is almost wholly of the huffy- white colour. 



Young examples not having the vving-joints completely ossified, 

 differ only in being somewhat smaller, and in having the fur less 

 bright ; but it is nevertheless distinctly bicoloured, and when ob- 

 viously immature they are still of greater size than adult examples 

 of N. Geoffroyi. 



In the table of dimensions, column No. I refers to a female spe- 

 cimen from Mr. Gould's collection from Moreton Bay ; No. 2 to 

 a male from the same locality ; and No. 3 to a specimen also col- 

 lected by Mr. Gould at Bathurst. 



1. 2. 3. 



in. lin. in. lin. in. lin. 



Length of the head and body, about . . Ill 20 



of the tail 110 1 8 



of the head 9 9 



of the ears 1 Oil 



of the tragus 3 3 



Breadth of ears 8 8 



of the tragus 2 2 



Length of the fore-arm 1 7\ 1 6^ I 7 



of the longest finger 3 i2 8 2 9 



of the fourth finger 2 4 2 1 2 



of the thumb A\ 4 4^ 



of the tibia 10 8i 8| 



of the foot and claws 4 4 4^ 



of the OS calcis 6 6 6^ 



Expanse of wings 11 6 10 9 11 4 



4. Nyctophilus unicolor, n. s. 



All the specimens of this genus I have yet seen from Van Die- 

 men's Land differ remarkably from those of the mainland of Au- 



