42 PYGATHRIX 



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." 



Pygathrix cheysomelas (Miiller). 



Semnopithecus chrysomelas Miill., Tijdsch. Natur. Geschied., V, 

 1838, p. 138, pi.; Miill. 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, Simise, 1876, p. 46. 



Semnopithecus (Trachypithecus) chrysomelas Reichenb., Voll- 

 stand. Naturg. Aflfen, 1862, p. 89, pi. 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. frontata, but crest thicker 

 and broader. Head, upper part of body, flanks, outer side of limbs. 



