Descriptions of East Asiatic Mammals 89 
truncate ears joined by a low band across the forehead. They 
are found from Europe, southern Russia, and Arabia to the 
Himalayas and China. One species, B. darjelingensis, that repre- 
sents them in the East, has the forearm about 1% inches long. 
It occurs from Assam and the Himalayas to Yunnan and 
Szechwan. 
The Flat-headed Bats, genus Tylonycteris, are very tiny 
species with a number of peculiarities. Besides the extraordi- 
narily flattened skull, they possess adhesive fleshy disks at the 
bases of the thumbs and on the soles of the feet. The number 
of teeth is 32. There are two chief types : T. pachypus (meaning 
"thick- footed") and T. robustula. The former occur in the 
Malay Peninsula, India, Burma, and Yunnan; the latter in the 
Malay Peninsula and Siam. The pachypus group are usually 
reddish brown and have the length of the forearm scarcely more 
than 1 inch. The robustula group are darker brown and have 
the forearm about 1 % inches long. 
The Disk-footed Bat, Disc opus denticulus from Laos, re- 
sembles the Flat-headed Bats in having a flattened skull and 
in its even more completely developed disk-like pads. It differs 
by having a greater number of teeth. The color is cinnamon- 
brown, the underparts near amber-brown. The forearm meas- 
ures 1% inches. 
Tickell's Bats, genus Hesperoptenus, are represented by 
tickelli, a good-sized light reddish brown Bat, with forearm 
2% inches. It is characterized by the fact that the outer upper 
incisor tooth stands directly behind the inner one, somewhat as 
in rabbits and hares. The Bat occurs in India and Burma. A re- 
lated species. Blan ford's Bat, H." blanfordi, found in Tenas- 
serim, is only half the size, the forearm l%o inches. It also is 
dull reddish brown. The thumb in H. blanfordi has an adhesive 
pad as in Tylonycteris. It is by no means certain that these two 
Bats should be kept in the same genus. Because the second is so 
rare, this point remains to be settled. 
