PYGATHRIX 67 



to a foliated tree, having a stony kernel. They were often observed 

 foraging in company with Hylobates syndactylus, but with this excep- 

 tion they were never seen along with other monkeys. One individual 

 which was taken alive, proved to be wild and untamable." 



Pygatheix potenziani (Bonaparte). 



Semnopithecus potenziani Bonp., Comptes Rendus, XLIII, 1856, 



p. 412, (note, desc. insufficient). 

 Semnopithecus chrysogaster Licht., Peters, Monatsb. K. Preuss. 



Akad. Wiss. Berlin, 1879, p. 830, pi. IVb; Blanf., Proc. Zool. 



Soc. Lond., 1887, p. 627 ; Id. Faun. Brit. Ind., Mamm., 1891, 



p. 38. 

 Preshytis chrysogaster Licht., Peters, Proc. Zool. Soc. Lond., 1866, 



p. 429 ; Blyth, Mamm. and Birds Burma, 1875, p. 10. 

 Semnopithecus pileatus Anders., Exped. Yunnan, Zool., 1878, p. 



13. (In synonymy). 



RED-BELLIED LANGUR. 



Type locality. ? Type in Berlin Museum. 



Geogr. Distr. Sipora, and South Pagi islands, Mettawee Group. 

 (Modigliani), (Abbott). 



Genl. Char. Small compressed crest from crown to nape ; whisker 

 tufts absent. Chin and lips with few white hairs. 



Color. Patch on top of head jet black ; front and sides of head, 

 and behind ears grayish white ; hind neck black, the hairs rufous at 

 base and tipped with black, the rufous showing on sides and above 

 shoulders ; rest of body, limbs, hands, feet and tail black, the rufous 

 of the base of hairs giving a tinge to the black ; throat and chest grayish 

 white ; under parts rufous. Young yellow. Ex type Berlin Museum 

 of P. chrysogaster. 



Measurements. Total length, 1,140; tail, 550. Skull: total length, 

 102 ; Hensel, 66 ; occipito-nasal length, 97.7 ; zygomatic width, 75 ; 

 intertemporal width, 41.1; greatest width of braincase, 54.6; palatal 

 length, 36.1; median length of nasals, 11.9; length of upper molar 

 series, 29.2; length of mandible, 74; length of lower molar series, 33.9; 

 length of canines, 17. 



This species has been considered the same as P. pileatus Blyth, 

 from which, however, it is quite distinct. Two examples are in the 

 Berlin Museum, the type, an adult animal from which my description 

 was taken, and a young one. They were stated to have been obtained 

 in Tenasserim, but that was a mistake as the species inhabits the 

 Mettawee group of islands off the west coast of Sumatra. 



