Descriptions of East Asiatic Mammals 85 
respect it somewhat resembles the Fish-eating Bat, Pizonyx, of 
Lower California, Mexico. 
The Long-eared Bats, genus Plecotus, are outstandingly 
different from all other Old World Vespertilionine Bats because 
of the relatively enormous size of the ears, which are about as 
long as the forearm ( 1 % inches ) . The typical species, P. auri- 
tus, extends from Europe to Japan, where the local race has 
Fig. 11. Head of 
Long-eared Bat, 
Plecotus auritus. 
Fig. 12. Head of Barbastelle, Bar- 
bastella barbastellus. 
been named P. a. sacrimontis. A slightly larger form, P. artel, 
is known from Szechwan, Kansu, and the Himalayas. In 
Siberia a species of Plecotus, probably referable to sacrimontis, 
has been taken in the Yablonoi Mountains as well as in trans- 
Baikal, northwest Mongolia, and Sakhalin. 
The length of the ear in these extraordinary Bats may reach 
1% inches. The ears are said to be kept in constant motion while 
the animal is resting, or again they may be cleaned and folded 
back motionless against the head and neck. The color is light 
gray or drab, somewhat tinged with buffy on the underside. 
Like many other Bats, these eat prodigious quantities of insects. 
Ognev mentions a peculiar case of Plecotus becoming entangled 
