40 PY GATHEIX 
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 NUDIFRONS (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. rronTaTA dwells. It has a squarish, not triangular 
bare spot on the forehead, divided by a line of short hairs. In color 
