162 LLOYDS NxVTURAL HISTORY. 



Hylobates hulok, Wagner, in Schreb., Saiigeth. Suppl., v., p. 20 



(1855.) 

 Hylobates niger, Harlan; Ogilby, P. Z. S., 1840, p. 21. 



Characters. — Black all over, except a frontal band, continuous 

 or interrupted, above the eyes. There is a good deal of varia- 

 tion in this species, more in the female than in the male, the 

 black being in many individuals of a brownish tinge. 



Young Males. — Often of a brownish-black, like many of the 

 females. 



Female. — With the black generally of a brownish tinge, but 

 often pale or greyish-yellow ; sometimes the upper parts are 

 pale yellow and the under parts and side of the head brown, 

 and the area round the nude parts of the face white. {Ander- 

 son}) 



Distribution. — Lower ranges of Bhutan — its furthest western 

 range — {Pemberton) ; hill ranges of Upper Assam {BIyth), Syl- 

 het, Chittagong, Aracan. 



Habits. — " I first met with this species in Upper Burma," Dr. 

 Anderson relates, " in passing through the magnificent defile 

 of the Irawaddy, below Bhamo, where the river is enclosed by 

 high hills, covered with dense forest, for about fifteen miles of 

 its course. It was early morning, and the air was resonant 

 with the loud cries of this Gibbon ; large troops were answering 

 each other from the opposite banks, and the hills echoed and 

 re-echoed the sound. The Hoolock is also common on the 

 Kakhyen hills, on the eastern frontier of Yun-nan ; and there, 

 too, my attention was called to them at daybreak, when they 

 passed up from their sheltered sleeping-ground in the deep and 

 warm valleys to heights of about 4,000 feet. We, in the 

 middle distance, first caught a faint murmur of voices, but 



