42 PYGATREIX 
molar series, 22.7; length of mandible, 64.4; length of lower molar 
series, 27.3. 
An adult female in the collection in the British Museum from 
the Bairam district, Sarawak, No. 0. 2. 2. 1, is peculiar in that the 
whole top of the head, flanks, and outer side of legs are reddish yellow, 
the top of head being mostly golden yellow, and the black line on 
front of leg is reduced to a small spot on the knee; while the under 
side of body is pale yellow. Whether this difference of color is due 
to age or individual variation it is difficult to determine. 
“This is a most remarkable monkey,” says Mr. Hose in his Mam- 
mals of Borneo, “which has lately been described by Mr. Thomas 
from a flat skin obtained by me some years ago at a place called Miri 
in the Baram district. I always considered the skin to be merely a 
striking variety of Semnopithecus femoralis. I shot the monkey on 
the sea coast along with a number of Semnopithecus femoralis; this 
was in the year 1887. I afterwards had the skin of a baby brought in, 
the markings of which were similar to that of the type, and it was 
obtained within a few miles of Miri, at a place called Bakam. But in 
September 1892, one of my Dyak hunters procured three fine adult 
specimens of this monkey on the Butang Lupar River in Southern 
Sarawak, and reported that they had seen several other specimens of 
like marking. In the three adult specimens, the black cross down the 
center of the back in some cases is broken, and the thighs are darker 
in some cases in one than in the other, but the striking red marking is 
kept up throughout each specimen.” 
PyYGATHRIX CHRYSOMELAS (Miiller). 
Semnopithecus chrysomelas Miill., Tijdsch. Natur. Geschied., V, 
1838, p. 138, pl.; Mill. und Schleg., Verhandl. Geschied., 
1839-44, p. 61, tab. X, figs. 1, 2, tab. II, figs. 2, 3; Schinz, 
Mamm., I, 1844, p. 37; Jacquem. et Pucher., Voy. Pole Sud, 
III, 1853, p. 22; Wagn., Schreb., Saugth. Suppl., 1855, p. 23; 
Schleg., Mus. Pays-Bas, Simiz, 1876, p. 46. _ 
Semnopithecus (Trachypithecus) chrysomelas Reichenb., Voll- 
stand. Naturg. Affen, 1862, p. 89, pl. XV, figs. 204-206. 
Type locality. Pontianak, Borneo. Type in Leyden Museum. 
Geogr. Distr. West coast of Borneo. Pontianak, (Schlegel) ; 
Baram District, (Hose) ; Balingean, Sarawak, (Robinson). 
Color. Head crested like that of P. rrontTaTa, but crest thicker 
and broader. Head, upper part of body, flanks, outer side of limbs, 
