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; it 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." 



Symphat.angus 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. 



This is a very small form of the Siamang, differing from it in no 

 respect save in size. 



