RH INOPITHECUS 105 



the Mekong in the vicinity of Yerkalo, Atentse and Tsekon. It is 

 certain that along the straight and elevated crest that separates the 

 Mekong from the Yantze-kiang in the places that are nearest to their 

 course, it is found in large troupes. It may be supposed that these 

 Rhinopitheques inhabit both sides of this chain, but at different 

 seasons ; in summer they would frequent the side towards China, 

 and descend eastward towards the right bank of the River Blue; 

 these would be the great black Monkeys mentioned by M. L'Abbe A. 

 David; in winter, on the contrary, they would take up their abode on 

 the western slope towards Thibet, and limited to the valley of the 

 Mekong, as is proved by the period in which our specimens were killed 

 by Mgr. Biet's hunters, several months after the last of August, 

 the date of the passage of Prince Henry of Orleans from Tsekon. 

 This last locality apparently is the approximate meridian limit of 

 their domain ; but to the northwest they must go quite near the 

 Thibetan Province of Kham, both M. Bonvalet and Prince Henry 

 of Orleans having seen them during their passage of the Tengri-Nor 

 at Batang. Finally, to the east, the River Blue would probably be 

 the natural barrier separating them from R. roxellance, their relative 

 of the Principality of Moupin, and south of the Province of Kansu." 



Rhinopithecus brelichi Thomas. 



Rhinopithecus brelichi Thos., Proc. Zool. Soc. Load., I, 1903, p. 

 224, pi. XXI. 



BRELICH'S LANGUR. 



Type locality. Unknown. Type in British Museum. 



Geogr. Distr. Van Gin Shan range of mountains, north of the 

 Province of Kwei-chow, 108° E. 29° N., Central China. 



Genl. Char. Size very large; fur on flanks longest; oval white 

 patch between shoulders ; tail very long. 



Color. Crown and cheeks yellowish, hairs tipped with black; 

 nape black, hairs broccoli brown, black tipped ; hind neck, hairs brown- 

 ish with black tips; large white patch between shoulders, hairs white 

 to roots ; upper part of body and flanks slaty gray ; sides of neck, hairs 

 pale orange tipped with black, the orange deepening in color as it 

 goes towards the shoulders and inner side of arms; outer side of 

 arms black; outer side of thighs silvery gray, legs below knees black; 

 inner side of limbs yellowish white, , becoming orange next to the 

 black on inner side ; throat black, hairs being gray, black tipped ; under 

 parts of body ashy gray; tail very long, black for the entire length, 

 and with a small white pencil at tip ; ears black, the edges all around 



