150 Zoological Society : — 



of the Pipistrelle, but has the facial portion a little broader. As in 

 that species, there is a rudimentary premolar, immediately behind 

 the upper canine, and placed in a line with the other teeth, so as to 

 be visible from the outside. In S. tralatitius the second premolar is 

 contiguous to the canine, and the first or rudimentary one is placed 

 in the angle formed by the two, and is only seen from the inside. 

 But the greatest peculiarity exists in the form and arrangement of 

 the upper incisors. In the generality of species appertaining to 

 this group, they are arranged in pairs, with a considerable central 

 opening, and the two inner ones somewhat longer than the outer, 

 and more or less in advance of them ; but in the present species, the 

 outer ones, adjoining the canines, are more in advance than the 

 inner ones, and are merely rudimentary. The curve which is made 

 by the row of upper incisors has, by this arrangement, its concave 

 surface directed forwards instead of backwards, as in other species. 

 The number of the teeth may be thus given : — 



Inc. V: Can. g; Prem. g; Mol. g=i5. 



Labuan. Sarawak. 



Length of the head and body 16 16 



of the tail 1 3 1 3 



of the head 6 ^ 



of the ears 2^ 3 



of the tragus 1| 2 



of the fore-arm 1 2 1 \\ 



of the longest finger 2 2 2 3 



of the fourth do 1 6 1 7 



of the thumb 3 2^ 



of the tibia 5f 6 



of the foot and claws 3|^ 3 



Expanse of wings 9 8 9 



The above are the dimensions of two adult individuals from the 

 localities mentioned ; younger ones differ in having the fingers con- 

 siderably sliorter, and the fore-arm a little shorter. 



5. ScoTOPHiLUSCiRCUMDATUs? FespertiUo circMmdatus,Temm. 



I refer this species, with some doubt, to the V. circumdatus of M. 

 Temminck. It agrees with it in most particulars, such as the form 

 of the head and ears, and in having the wing-membranes extending 

 only to the extremity of the tibiae ; but it differs in being somewhat 

 smaller, in having the fur shortish and unicoloured, whereas that of 

 circumdatus is, according to M. Temminck, long, and of two colours. 



For the present, I prefer leaving it under the name above given, 

 until a greater number of specimens can be examined. 



I have to thank Mr. Dillwyn for the opportunity of describing the 

 species mentioned in this paper, and for the great liberality with 

 which he has allowed me to make any use of his specimens which 

 might be desirable for the purpose of description. 



