180 SYMPHALANGUS 
from the continent and from Sumatra to decide whether or not a 
separation, even of a racial kind, between the two is required. 
Captain Flower states, (1. c.) that “no gibbons are found wild 
in the islands of Penang or Singapore, though they are very generally 
distributed over the mainland; when met with in the jungle it is very 
hard to identify the species, and it is of little use and cruel to attempt 
to shoot them with a shot gun; if a specimen be needed, kill it with a 
rifle-bullet. In September 1897, at the foot of Gunong Pulai in Johore, 
I saw both black and white gibbons of apparently the same species, but 
I cannot say which. In March 1897 near Tahkamen, Siam, there were 
many in the high trees in the thick jungle; their call was loud and 
musical, ‘Pua, pua, pua, pua, pua, pua,’ beginning slowly and 
gradually getting faster. One morning we followed up an individual 
for a long time; 1t was a very large black gibbon, extremely agile. 
Occasionally it progressed by running along the boughs, but generally by 
swinging by its hands; every now and then it leaped down vertically to 
a great depth among the branches, as if falling, but it never actually 
came to the ground. In the forest of the Dong Phya Fai (between 
Ayuthia and Korat), at about 900 feet elevation, I have heard gibbons 
making a great noise in the early morning; judging from the cry, I 
should say it was the same species heard at Tahkamen.” 
SYMPHALANGUS KLOSSI Miller. 
Symphalangus klossi Miller, Miscel. Coll. Smith. Inst. Wash., 1903, 
p. 70. ' 
Type locality. South Pagi Island, west of Sumatra. Type in 
United States National Museum. 
Genl. Char. Size small; color as in S. syNDACTYLUS. 
Color. Black everywhere. Ex type United States National Mu- 
seum. 
Measurements. Total length, 440-525; foot, 130-154. Skull: 
total length, 96; occipito-nasal length, 80.7; Hensel, 68.1; zygomatic 
width, 63.4; intertemporal width, 45.3; palatal length, 36.8; median 
length of nasals, .91; length of upper molar series, 22.5; length of 
mandible, 66.5; length of lower molar series, 27.3. Ex type United 
States National Museum. 
a 
This is a very small form of the Siamang, differing from it in no 
respect Save in size. 
