170 HYLOBATES 



Color. The type of H. agilis F. Cuvier, or one so styled on label 

 and received in the Paris Museum in 1821, is yellowish white on head, 

 upper parts and sides of body, limbs and hands ; feet pale brown ; 

 throat and under parts of body pale ochraceous, or an orange shade ; 

 top of head tinged with buff. The specimen is doubtless faded and is 

 much soiled with the dust of nearly a century. 



Measurements. Skull: occipito-nasal length, 89; Hensel, 80; 

 zygomatic width, 65 ; intertemporal width, 48 ; median length of nasals, 

 10 ; length of upper molar series, 25 ; length of mandible, 70 ; length of 

 lower molar series, 28. 



This is one of the most variable species of the genus Hylobates, 

 and in color ranges from the tj'pical yellowish white described above 

 to jet black, with perhaps a narrow white superciliary stripe. These 

 many variations, as is to be expected, have produced numerous syno- 

 nyms, and not a little confusion, especially among the earlier writers 

 who could not be cognizant of the fact that these striking diiferences 

 were of no specific value, but merely evidences of individual eccen- 

 tricities. Thus the melanistic style received the name of raMesi; and 

 another variable form that of variegatus. Like H. lar, the index and 

 middle toes are sometimes united by a web. 



Hylobates pileatus Gray. 



Hylobates pileatus Gray, Proc. Zool. Soc. Lond., 1861, p. 136, pi. 

 XXI ; Reichenb., Vollstand. Naturg. Aflfen, 1862, p. 174, figs. 

 482-484; Matschie, Sitzungsb. Ges. Natur. Freund., Berl., 

 1893, p. 209. 



Hylobates agilis S. S. Flower, Proc. Zool. Soc. Lond., 1900, p. 313. 



Type locality. Cambodgia. Type in British Museum? 



Geogr. Distr. Cambodgia; Paknam Kabin, Siam; Cochin China. 



Color. Top of head from forehead to rear of crown, sides of face 

 before ears, throat and under parts of body to end of abdomen jet 

 black ; superciliary stripe, hairs around the black crown, and inner 

 side of arms and legs yellowish white ; rest of pelage grayish buff 

 inclined to brownish on outer side of arms. 



Measurements. Head and body, 440; foot, 150. Skull: occipito- 

 nasal length, 86 ; Hensel, 75 ; zygomatic width, 60 ; intertemporal width, 

 48; median length of nasals, 9; length of mandible, 67; length of 

 upper molar series, 25 ; length of lower molar series, 30. 



This is another wonderfully varied species as regards the dis- 

 position and extent of the black. The description given above is 



