674 Mr. O. Thomas on 
sericeus. And in the lower jaw, both in carmelite and coccygts, 
there are three small intermediate unicuspids, while there are 
only two in the three available specimens of serdceus. 
Dimensions of the type (measured on the skin) :— 
Head and body 515 mm.; tail 330; hind foot 51. 
Skull: condylo-basal length 86 ; zygomatic breadth 53°7 ; 
nasals, length 33°6, least breadth 8, greatest breadth 14 ; 
intertemporal breadth 9; mastoid breadth 42; diagonal 
diameter of secator 5; combined length of ms’? 16°53. 
Hab. Saruwaged Mts., alt. 3000 m. 
Type. Adult male. Original number 26. Collected August 
1914 by C. Keysser. 
This species is no doubt very nearly allied to PA. carmelite, 
but its larger size and the development of a dorsal line seem 
to justify its being given full specific rank, especially as the 
third chocolate-coloured cuscus, PA. sericeus, proves to differ 
from both the other species by a permanent difference in the 
number of intermediate teeth present. ‘This character is 
usually considered impermanent and untrustworthy, but is 
here constant through a series of 14 skulls of the three forms. 
12. Pseudochirus corinne argenteus, Forst. 
3, R.M. 5. Saruwaged Mts. 
3, R. 15. Rawlinson Mts. 
Not sexed, R.10. Rawlinson Mts., 1500 m., June 1911. 
The last specimen appears to be the example of “ corinne,” 
which, by its unusually strong coloration, induced Prof. 
Férster to apply the rather unsuitable name of argenteus to a 
Jess rufous example. 
South of the present region there seems to be a definable 
subspecies of this group, which may be called 
Pseudochirus corinne cecias, subsp. n. 
Size rather smaller than in true corinne, and colour more 
reddish brown. General colour above, as compared with that 
of corinne, more umber-brown, the rump and base of tail 
near “ Brussels-brown ” or even approaching “ hazel.” Face 
“buffy brown ” instead of “ hair-brown.” Otherwise the 
character of the markings, the dorsal black line, and the light 
ear-patches are all as in true corinne. 
Skull smaller than in eorinne ; nasals less expanded behind. 
Dimensions of the type (measured on skin) :— 
Head and body 340 mm,; tail 275 ; hind foot 40. 
Skull: greatest length 61; upper length 58; zygomatic 
