PYGATHRIX S3 



DUSKY LANGUR. 



Type locality. Unknown. 



Geogr. Distr. Tenasserim, Mt. Muleyit, 5,000 feet elevation; 

 Siam. 



Color. Fore part and sides of head black, the hairs on forehead 

 rather stiff, those in center standing erect, those on side shooting away 

 at right angles to head ; hairs on side of head very long extending far 

 behind ears ; crown of head brownish black ; occipital crest brownish 

 white; dorsal line Prout's brown, sometimes mummy brown, always 

 lighter than rest of upper parts which are sooty black, this color also 

 extending over the flanks ; arms above elbows paler, sometimes yellow- 

 ish brown, sometimes with a reddish shade ; forearms and hands black 

 or brownish black ; space around eyes yellow in skin, probably flesh 

 color in life, rest of face black ; some white hairs on upper lip and 

 on chin; throat sparsely covered with blackish hairs, as is also the 

 under side of the arms ; a black bar across chest at shoulders ; rest of 

 under parts grayish brown ; outer edge of thigh to knee black ; outer 

 side grayish brown ; inner side slightly paler ; hands and feet black ; tail 

 at base above like back, rest dark olive gray, peneath paler. 



Measurements. Total length, 1,120; tail, 570; foot, 145, (skin). 

 Skull : total length, 96.6 ; occipito-nasal length, 80 ; intertemporal width, 

 42.8 ; width of braincase, 55.3 ; Hensel, 68 ; zygomatic width, 73.5 ; 

 median length of nasals, 11.2; length of upper molar series, 27.9; 

 length of upper canines, 17.9 ; length of mandible, 72.3 ; length of 

 lower molar series, 33.9. 



This is a well marked species of the Malay Peninsula, easily 

 recognizable by the light nuchal crest, and the paler dorsal line amid 

 the general sooty black upper parts. There is a certain amount of 

 variation among individuals some being lighter than others, but they 

 all adhere to the same pattern, and are easily recognizable. The newly 

 born young, according to Anderson, are bright fulvous, but this color 

 soon changes and becomes ashy brown. This rufous color lingers 

 longest on the head, throat, flanks, thighs and apical half of the tail. 

 Reid's mention of this species (1. c.) contains no description of the 

 animal, and the name obscurus could not be accepted had it not been 

 adopted by subsequent authors who gave full descriptions, in some 

 cases taken from Reid's own example, and these were published prior 

 to the bestowal of any other name upon the species. The type of 

 Semnopithecus albo-cinereus Eydoux et Souleyet, is in the Paris 

 Museum, and, as their plate shows, is the same as S. obscurus Reid. 



