40 PYGATHRIX 



the different color of the body, the tail of the northern species in no 

 way resembles that of P. frontatus, being a silvery gray with a 

 brown tinge. 



Pygathrix nudifeons (Elliot). 



Presbytis nudifrons Elliot, Ann. Mag. Nat. Hist., IV, 8th Ser., 

 1909, p. 266. 



Type locality. Byalong, Sarawak. Northwest Borneo. Type 

 in British Museum. 



Genl. Char. Bare spot on forehead like in P. frontata, divided 

 in the middle by a line of short black hairs running from forehead to 

 end of nose, these hairs growing towards each other from each side, 

 and forming a low ridge where they meet ; crest equally long through- 

 out its length from forehead to nape, hairs turned forward ; no brown 

 coloring on any part of the pelage. Skull : without the high forehead 

 of P. FRONTATA, this being only slightly raised, and the superior outline 

 descending rapidly to occiput. 



Color. Forehead, orange yellow, face flesh color ; eyelids black ; line 

 of short hairs down line of nose from forehead, black ; hairs on upper 

 lip and cheeks black, those from the latter very long, and extending 

 to a point along the neck ; hair from corner of the eye, and hairs from 

 forehead, black, very long, directed backward along side of head join- 

 ing together on temples ; hairs on center of head to nape, long, erect, 

 directed forward forming a crest, sepia in front grading to slate gray 

 on hind neck ; entire upper part and sides of body slaty gray ; outer 

 side of arms to below elbows, and inner side of legs to near ankles 

 feet, black ; throat white ; under parts of body brownish gray ; inner 

 side of arms to below elbows, and inner side of legs to near ankles 

 grayish white, darkest on legs below knee; tail above and beneath 

 black at base, remainder silvery gray with a brown tinge. Ex type 

 British Museum. 



Measurements. Total length, 1,170; tail, 645; foot, 160, (skin). 

 Skull : total length, 98.5 ; occipito-nasal length, 87.7 ; intertemporal 

 width, 48.1 ; Hensel, 58.9; zygomatic width, 71.8; width of braincase, 

 55.5; median length of nasals, 12; palatal length, 26.7; length of upper 

 molar series, 25; length of upper canines, 16; length of mandible, 15.9; 

 length of lower molar series, 29. Ex type British Museum. 



This species is found on the opposite end of Borneo from the 

 locality in which P. frontata dwells. It has a squarish, not triangular 

 bare spot on the forehead, divided by a line of short hairs. In color 



