PLECOTUS AUEITUS. 
115 
Fur ashy grey or greyish brown above, greyish white below. The basal portion of 
the fur very dark brown. 
Inner upper incisor bifid, inner cusp much longer than the outer. Outer upper 
incisor small, lying outside the external cusp of the former, but not so long as it. 
First upper preinolar small, close to the canine, conical, about one-third the length 
of the second upper premolar, which is very large and longer than the molars. Lower 
incisors markedly trifid. First lower premolar less than half the height of the canine 
lying close to it. Second lower premolar half the size of the first, separated slightly 
from the third, which is large and nearly as high as the adjoining molar. In one 
specimen (Tor, Arabia) the second premolar has its crown partially hidden by the 
crown of the first premolar, which is placed external to it. 
Grizeh, Egypt. 
Duirat. 
Devonshire. 
6 • 
d. 
d. 
inm. 
mm. 
mm. 
Snout to vent. 
... 45 
45 
43 
Vent to tip of tail. 
... 50 
49 
44’5 
Length of head. 
... 19 
19 
18-4 
Height of ear. 
... 35 
35 
35 
„ tragus . 
... 18 
18 
17-3 
Breadth of tragus. 
... 6-5 
6 
5 
Inner canthus of eye to tip of snout . 
... 6-2 
7 
6’6 
Length of forearm. 
. . . 40-5 
40 
38 
,, thumb. 
... 8 
9 
10 
,, 2nd metacarpal. 
... 34 
33 
31-6 
3rd „ . 
... 36 
35 
33 
4th „ . 
34-5 
32 
,, 5 th ,, . 
. , . 33-5 
33-6 
31 
,, tibia. 
... 19 
18 
18 
„ foot . 
... 8 
10-5 
10 
Stretch of wing. 
... 256 
262 
248 
Geoffroy was under the impression that the examples of the long-eared bat found 
in Egypt were smaller than the European bats, but this does not appear to be the 
case. The snouts of bats from Devonshire (England) are much broader than those 
of Egyptian individuals, whilst in bats from Duirat, on the confines of Tripoli, the 
snouts are intermediate between the two. 
This species has been met with in Egypt in the recesses of the Pyramids and in 
those of other monuments, also in houses and in caverns. These are much the same 
conditions as those in which it is found in Europe, where it is also known to live in 
trees hollowed by decay or by age. The large ears, equalling the body of the animal 
in length, are held horizontally forward in flight; and the flight, which is rapid and 
Q 2 
