22 MAMMALIA PRIMATES. [VESPERTILIO. 



forming a moustache : a large sebaceous gland above the eye advancing 

 towards the nose, of a yellowish white colour ; another gland on the 

 upper lip immediately above the canine tooth, of the same colour with 

 the rest of the face, causing a protuberant swelling at that spot, and 

 furnished with long bristles : ears oblong-oval, rather broad, about the 

 length of the head, the inner margin bending outwards, the external 

 margin nearly straight, with a shallow notch about midway, nearly 

 naked, excepting towards the base on the outside ; tragus longer than 

 in the last species, lanceolate, curving slightly outwards towards the tip, 

 naked : flying and interfemoral membranes naked ; the latter ample, fur- 

 nished with a long spur*, between which and the end of the tail the 

 margin has a crenate or puckered appearance, and is set with short 

 bristly hairs; tip of the tail somewhat blunt and compressed, scarcely 

 exserted for more than half a line : hind claws very strong, furnished 

 with long hairs: thumb much smaller than in the last species. Fur 

 long and silky, particularly about the upper part of the head and neck, 

 of a li^ht rufous brown, approaching to reddish gray above, the tips of 

 the hairs being of this colour, the roots dusky brown ; beneath silvery 

 gray at the tips, black towards the roots : ears yellowish gray, the yellow 

 tinge being most obvious within towards the base ; tragus almost entirely 

 yellowish: flying and interfemoral membranes dusky, but the latter 

 paler than the former. In the female, the colour of the fur on the 

 upper parts has a more reddish tinge than in the male. 



This species occurs in hollow trees in the neighbourhood of buildings 

 at Swaff ham Prior in Cambridgeshire. Mr Yarrell has received it from 

 Colchester and Norwich. There are also specimens in the British 

 Museum taken near London. It appears however to be very locally 

 distributed. 



28. V. Serotinus, Gmel. (Serotine.) Ears oval-trian- 

 gular, shorter than the head ; tragus semicordate : muzzle 

 short, and obtuse : fur chestnut brown above ; pale be- 

 neath. 



V. Serotinus, Desm. Mammal, p. 137. La Serotine, Buff. Hist. Nat. 

 torn. vni. pi. 18. f. 2. 



DIMENS. Length of the head and body two inches seven lines ; of the 

 head ten lines; of the tail one inch ten lines; of the ears eight lines; of 

 the tragus three lines ; of the thumb three lines : extent of wing twelve 

 inches six lines. 



DESCRIPT. Face almost naked : muzzle remarkably short, broad, and 

 obtuse ; extremity of the nose one line and a half across : ears oval, 

 approaching triangular, shorter than the head, with the inner margin 

 bending outwards in an arcuate form, externally hairy on their basal 

 half, naked above ; tragus semicordate, somewhat elongated, pointed at 

 the extremity. Fur in the male of a deep chestnut brown on the upper 

 parts, passing beneath into a yellowish gray ; that of the female said to 

 be much brighter. 



Apparently a rare species in Great Britain : has hitherto only occurred 

 in the neighbourhood of London. Is said to frequent trees, and also 

 houses occasionally. Habits somewhat solitary. 



* By the spur I mean a long tendinous process from the heel of the foot which runs along the 

 margin of the interfemoral membrane and serves to stretch it. It in fact represents the os calcis. 

 It will be found of very different length in different species, varying from three to seven lines or 

 more. 



