680 On Two new Subspecies of Phalanger orientalis. 
LXXXV.—Two new Subspectes of Phalanger orientalis. 
By OLDFIELD ‘THOMAS. 
(Published by permission of the Trustees of the British Museum.) 
Phalanger orientalis ducatoris, subsp. n. 
Intermediate in size between orientalis and breviceps. 
Colour and general appearance, at least of female, as in 
breviceps ; adult male not known. General colour above of 
the usual dark grey varying to brown; under surface dull 
whitish. Dorsal line present, not conspicuous. Hairy part 
of tail like body, not yellowish as it generally is in breviceps. 
Skull rather larger than that of breviceps, considerably 
smaller than in orientalis. Muzzle and interorbital region 
distinctly longer than in the former. Supraorbital ridges 
well developed, more so than in female ortentalis, but whether 
the male has the greatly developed ridges found in breviceps 
is not at present known. Teeth and other characters about 
as in breviceps. 
Dimensions of the type (measured on skin) :— 
Head and body 520 mm.; hind foot 62. 
Skull: back of glenoid fossa to gnathion 65; postorbital 
process to tip of nasals 47; zygomatic breadth 46; nasals 
33x12°2; interorbital breadth 10; dental length 41:3; 
greatest diameter of secator 4; ms!° 15. 
Hab. Duke of York Island, between New Britainand New 
Ireland. 
Type. Adult male. B.M. no, 78. 2.5.6. Collected by 
the Rev. G. Brown. 
This is the animal which Alston referred to orvental/s *, and 
which in the Catalogue I placed with the Solomon Island 
Cuscus—Phalanger breviceps. It is, however, evidently an 
intermediate form inhabiting the Duke of York group and no 
doubt both New Britain and New Ireland, and should appa- 
rently have a special subspecific name. 
On the other hand, the Phalanger of Ruk Island, between 
New Britain and the mainland, is as large as true Ph. orien- 
talis. 
Phalanger orientalis mimicus, subsp. n. 
As in true insular orientalis, but much smaller. General 
colour of a male very similar to topotypical Amboina orten- 
talis, the upper surface pale drabby grey, more intense across 
* Cuscus orientalis, P. Z.S. 1877, p. 126. 
