174 HYLOBATES 



1825, but in Part II of the same volume of the Journal of the Phila- 

 delphia Academy of Natural Sciences, bearing the date 1827, his 

 paper on Hylobates occurs, but it is stated that it was read 

 on the 17th October, 1826, as already mentioned. The type came 

 from Borneo, and could not be referred to S. syndactylus, of which 

 Trouessart makes it a synonym, as that species is not found in Borneo, 

 and moreover Harlan expressly states his specimen had no gular sac, 

 which is a characteristic appendage of the Sumatran Gibbon. Lesson 

 (1. c.) gave the name of harlani to H. concolor Harlan and states 

 it came from Borneo, and copies mostly Harlan's account of the animal, 

 falling also into his error in considering it an hermaphrodite. Lesson 

 makes no mention of Hainan, and it is difficult to see how the name 

 harlani could possibly be applied to the species from that island, as is 

 done by Trouessart. 



Dr. Lyon has separated the Gibbon, obtained by Dr. Abbott along 

 the Mattan River, from H. concolor as a subspecies under the name 

 of H. miilleri albibarbis. I had already examined Dr. Abbott's speci- 

 mens, and, as the almost incredible variation of which the Bornean 

 Gibbons are capable is very familiar to me, through the study of 

 Mr. Hose's striking examples as well as of the many specimens 

 scattered throughout the Museums of the world, I was unable to 

 find any character that was reliable for separating individuals from 

 different parts of the island. Dr. Lyon's characters are solely founded 

 on color, which in the Bornean Gibbon especially, is not a character 

 but purely an individual variation. Dr. Lyon found no difference 

 whatever in the skulls, as was to be expected. I have placed the name 

 among the synonyms of H. concolor. 



Hylobates FUNEREus (I. GeofFroy). 



Hylobates funereus I. Geoff., Compt. Rend., XXXI, 1850, p. 874; 

 Id. Cat. Primates, 1851, p. 7; Id. Archiv. Mus. Hist. Nat., 

 Paris, V, 1852, p. 532, pi. XXVI ; Gerv., Hist. Nat. Mamm., 

 1854, p. 53 ; Wagn., Schreb., Saugth. Suppl., V, 1855, p. 18 ; 

 Reichenb., Vollstand. Naturg. Affen, 1862, p. 174, fig. 445. 



DARK GIBBON. 



Type locality. Sulu Island? Type in Paris Museum. 



Geogr. Distr. Islands of Sulu Archipelago? 



Color. Eyebrows whitish; top of head, sides of head, throat, 

 under side of body, and inner side of limbs blackish brown ; rest of 

 pelage, head, body, limbs, hands and feet, grayish white with a brownish 

 tinge. Ex type Paris Museum. 



