5'22 On a nexi', Fli/ing-Sqnirrel from Formosa. 



speckled liairs. Head with a rather inconspicuous short and 

 narrow pale brow-band ; the rest of the head, the cheeks, 

 and the dorsal and lateral surfaces of the body uniformly 

 davk-colourod, the hairs being finely speckled with brownish 

 yellow. No white on the throat or chest, the underside 

 being for the most part of an olive-grey or brownish-grey 

 hue. The arms and legs speckled to the wrists and ankles, 

 but darker than the body, especially upon the upper arm and 

 thigh, the speckling being less apparent than on the body ; 

 hands and feet for the most part black above. Tail the same 

 colour above as below, speckled and tinted like the body in 

 the basal two thirds of its length, with its distal third black. 



The whiskers are fall and directed obliquely backwards 

 and downwards, and the coat is fairly thick and long. 



Loc. The Ituri Forest. 



A single living specimen belonging to the Hon. Walter 

 Eothscliild and procured from Mr. J. D. Hamlyn, after 

 whom the species is named. 



This is a very distinct species. By the analytical key to 

 the groups of species of the genus Cercopithecus published 

 in my recent monograph (P. Z. S. 1907, p. 681) of these 

 monkeys it falls under heading "y " — that is to say, with 

 the species of the heucam-pyx- and Alhogular%s-^xo^x\^'5, ; but 

 it has not the black fore limbs and white throat of either 

 section, and further differs from both in the uniformity in 

 tint and speckling between the head and body, in lacking the 

 black of tlie head and nape characteristic of the Leucampyx- 

 group and the brighter red or yellow hue of the dorsal area of 

 the body of the Albog^daris- group. Finally, the peculiar 

 white line down the centre of the face is quite unique. 



LXXVII. — A next! Flying- Squirrel from Formosa, 

 By (Jldfield Thomas. 



Petaurista Una, sp. n. 



A beautiful rufous species with a pure white head and 

 under surface. 



General colour above a brilliant chestnut-rufous, much as 

 in P. grandis, but less dulled by blaci<. This colour extends 

 over the upperside of the neck from the occiput, the back, and 

 the whole of the upperside of the parachute down to the 

 elbows and ankles. Under surface and inner side of limbs 

 pure white throughout or slightly tinged with yellowish. 

 Head also pure white above and below, bounded abruptly 

 behind by the rich rufous of the nape; a few rufous hairs 

 forming a narrow rim round the eyes. Ears long, oval, 



