58 VESPERTILIONIDJS. 



placed immediately above the margin of the lip. Ears 

 oblong-oval, as long as the head, rather more than half 

 as broad as they are long ; the extreme inner margin 

 reflexed ; the outer margin scarcely notched, extending 

 downwards and forwards to meet the inner margin at 

 the base ; tragus two-thirds as long as the auricle, very 

 narrow, lanceolate, thin, and naked. Eyes very small. 

 Flying membrane semi-transparent, naked ; interfemoral 

 portion with only eight transverse lines; the spur very 

 long, and the margin of the membrane from the spur to 

 the tip of the tail crenate, and furnished with a lash of 

 stiff short hairs. Exserted portion of the tail very short. 

 The colour of this Bat is lighter than that of the 

 other British species, with the exception of the Vesper- 

 tilio murinus. The fur above, which is long and soft, is 

 light reddish brown, with a grey glance, from the tips 

 of the hairs being greyish, and the roots of the former 

 colour. Beneath it is light silvery grey, the tips of the 

 hair being white, and the roots nearly black. The ears 

 and muzzle pale. The membrane smoky grey with a 

 slight rufous tinge. 



\ 



Dimensions : 



Inch. Lines. 

 Length of the head and body . . . .111 



,, of the head 08 



, , of the tail 18 



,, of the ears 08 



Breadth of the ears 3 



Length of the tragus . . . . .05 

 Extent of the wings . . . . . . 11 



Dentition : 



I. | : C.j : F. M. g : M. } = & 



Desmarest has given an erroneous statement of the 

 number of teeth in this Bat : he says there are but five 



