BYGATHEEX 83 
is quite different, and renders doubtful the value of characters depend- 
ing upon any peculiar set of such hairs, as they are so easily distorted 
both in skins and mounted specimens. Hairs on side of head very 
long passing far beyond ears; and hairs on flanks long falling below 
line of body in light specimen; tail very long, slender. 
Color. Face black; hairs on forehead black; top of head, neck, 
upper parts of body and flanks, arms to elbows, and hind limbs to 
ankles brownish gray, silvery gray in certain lights, darkest on dorsal 
region; long hairs on side of head, silvery brown; forearms, hands 
and feet black; under parts silvery gray; tail iron gray, hairs tipped 
with silvery white; tip blackish. 
The darker specimen has the forehead blackish brown; top of 
head and dorsal region blackish brown, hairs tipped with silvery 
white; flanks pale brown; front of shoulders and arms above elbows, 
and forearms black, hairs tipped with white, giving a grayish aspect 
to forearms; middle of shoulders brownish gray; hind limbs to ankles 
brownish gray; hands and feet black; throat and under parts and 
inner side of limbs yellowish white ; long hairs on sides of head yellow- 
ish brown; tail blackish brown. 
It will thus be seen that one specimen is much darker than the 
other, more dark brown than silvery brown. Both are marked types! 
Measurements. Total length, 1,074.6; tail, 641.2; foot, 139.7. 
Skull: total length, 103; occipito-nasal length, 83; Hensel, 74; inter- 
temporal width, 41; zygomatic width, 76; palatal length, 39; breadth 
, of braincase, 55; median length of nasals, 13; length of upper molar 
series, 27; length of mandible, 73; length of lower molar series, 34. 
Ex type Paris Museum. Specimen marked “Type.” 
Flower states, (1. c.) “when on the Bangpakong River in Siam in 
March, 1897, we from time to time saw flocks of from 10 to 20 
monkeys of this species in high trees in patches of jungle. The skin of 
the face is entirely black, the iris dark brown. A male I shot near 
Tahkamen measured :—Head and body 23% in. (or 587 mm.) ; tail 
with end hair 33 in. (or 838 mm.) ; without end hair 3114 in. (or 800 
mm.)”’ 
“On April Ist, 1897, I bought from a Siamese at Tahkamen a 
young monkey apparently of this species; it was evidently very young 
and was weak and feeble. We tried feeding it at first with a bit of 
cotton wool soaked in tinned milk and water (fresh milk was not 
to be had), but soon a young Siamese woman offered to suckle it, and 
she fed it with her own milk till we left Tahkamen on the 5th April; 
