Two new Rats. 199 
area perhaps a little more limited in extent than usual, 
especially behind. Hands white. Feet greyish brown with 
white digits. Tail as long as in ewcelsior, well haired, 
blackish above for three-fourths its length, white below and 
for its terminal two or three inches above. 
Skull decidedly larger than that of confucianus, about 
equalling that of exceisior, from which it differs by having 
well-developed supraorbital ridges, as in the first-named 
species. Palatal foramina long and well open. 
Dimensions of the type, measured on skin :— 
Head and body 186 mm. ; tail 216; hind foot 34. 
Skull, greatest length 42; condylo-incisive length 37:2; 
zygomatic breadth 18°6; nasals 16; interorbital breath 6 ; 
breadth of brain-case 16; palatilar length 18; palatal 
foramina 8°4; post-foraminal palate 7; molar series 7:2. 
Hab. Mt. Arizan, Formosa. Alt. 8000 ft. 
Type. Adult male. B.M. 12.11.23.21. Collected Feb. 
1912 and presented by Walter Goodfellow, Esq. Seven 
specimens. 
Whether this is a Formosan representative of R. excelsior 
of the Western Chinese Highlands or simply a larger island 
form of R. confucianus it is not easy to say, but on account 
of its highland habitat, and the curious relationship that 
Formosan animals often have to Tibetan forms, I am rather 
in favour of the former view. But in any case it needs a 
distinctive name. 
Rattus confucianus chihliensis, subsp. nu. 
A greyish north-eastern form of confucianus, with com- 
paratively short tail. 
General colour of summer skins greyish-brown approxi- 
mately as in the true Sze-chwan confucianus, not strongly 
buffy clay colour as in sacer, canorus, and luticolor, which in 
Shantung, Kansu, and the Ordos region make a line of pale 
forms separating the present darker, or at least greyer, 
animal from the Sze-chwan race. Under surface white, 
sharply defined, the white of considerable extent, with the 
line of demarcation high up. Hands and feet white, with 
slight metatarsal darkening. Tail comparatively short, 144, 
146, and 158 mm. in three examples as compared with 
lengths of 155-180, usually about 170, mm. in the other 
forms ; well haired, slightly pencilled, the terminal 2-3 
inches white all round. 
Skull as in R. c. sacer, except that the palatal foramina 
