46 PYGATHRIX 



narrow white line from throat to abdomen ; face, palms of the hands, 

 and soles of feet black ; under parts blackish, or sooty gray of varying 

 intensity, in some examples nearly white. 



Measurements. Total length, 1,225; tail, 725; foot, 140. Skull: 

 total length, 98.2; occipito-nasal length, 76; intertemporal width, 47.1 ; 

 Hensel, 57.8; zygomatic width, 68.9; width of braincase, 56; median 

 length of nasals, .75 ; palatal length, 45.8 ; length of upper molar series, 

 23.7; length of mandible, 63.9; length of lower molar series, 28. 



This species varies considerably in its coloring, dependent ap- 

 parently upon age. Some specimens, and these are young, have the 

 thighs grayish in hue, dorsal line a paler brown and the under parts 

 nearly white especially on lower part of the belly, the older individuals 

 being like the description given above. The tail, however, is never 

 whitish at the base beneath, and in this differs from P. chrysomelas, 

 which always has this part of the tail white. In some specimens there 

 is a white line from throat to posterior part of abdomen. 



Schlegel has separated this form with white line beneath as Sem- 

 nopithecus neglectus, and says it is found only at Singapore. Among 

 the specimens of P. femoralis in the British Museum there are three 

 with this mark, one from Johore, collected by Capt. S. S. Flower, 

 the white line rather indistinct ; one from Singapore collected by Wal- 

 lace, and one from Tenasserim collected by Davison, the line very 

 distinct in both. As, however, other Tenasserim examples have not 

 the white line nor any trace of it whatever, unless it can be shown, 

 that somewhere in Tenasserim there is a point beyond which, to the 

 north or south, neither style passes, it would be wiser to consider this 

 white mark rather an individual peculiarity, than a specific character. 

 It certainly is not confined to individuals from Singapore, as was sup- 

 posed by Schlegel, nor even to the southern part of the Malay Penin- 

 sula. Hose (1. c.) mentions the white line, "from the chest, in the 

 adult, to the hinder portion of the abdomen" seen in specimens taken 

 in Borneo, so it would seem that the character Schlegel mainly relied 

 upon for his new species, is not confined to any locality. 



Messrs. Robinson and Kloss have described (1. c.) a monkey of 

 this genus from Trang, and the Larut Hills, Central Perak, Malay 

 Peninsula, as Presbytis neglecta keatii, comparing it with P. neglecta 

 (Schlegel), from which it differs in having a generally browner colora- 

 tion, no white on the chest, and the white femoral line produced to the 

 heel. As has been shown above, P. neglecta (Schlegel) cannot be sepa- 

 rated from P. FEMORALIS, the character relied upon not being of any 



