BODEN KLOSS: Rats and Mice. 123 
Above clay coloured, slightly ochraceous on the nape and sides and darkened 
dorsally by the tips of the numerous flat spines. Underparts, inner sides of the limbs 
and the hindfeet white, sharply margined. Muzzle brownish and the eyes surrounded by 
dark rings. Tail bicolored with a pale tip. Mammae 2 — 2 = 8. Dorsal pelage 
very spiny. 
Type. Adult female (skin and skull) with slightly worn teeth. Collected on 
Serasan Id, South Natoena Islands, off Western Borneo on 12th August 1916. No. 185. 
Skull measurements of the type: greatest length, 47; condylo-basilar; 
length, 40; palatilar length, 20; combined palatal foramina, 6.9 X 4.0; diastema, 13.8; 
upper molar row (alveoli), 69; greatest breadth of nasals, 5.7; interorbital breadth, 7.4 
zygomatic breadth, 21.3 mm. 
Remarks. | have hitherto considered Rattus surifer (MILLER) to be the 
Malayan representative of R. rajah (THOS.) of Borneo. Mr, H. C. ROBINSON 
has recently, however, examined the type series of the latter and finds it to 
be of the same species as À. pellax (MILLER) of the Malay Peninsula. ') 
The two super-forms in Malaysia are, therefore, Rattus surifer and R. rajah. 
The races of these in Borneo, the Malay Peninsula and Sumatra are 
respectively:— 1. Rattus rajah rajah, R. r. pellax and R. r. similis. 
2. Rattus surifer surifer, R.s. bandahara?) and R.s. ravus. Rattus rajah 
has not yet been taken in Java and I cannot separate Javanese examples 
of R. surifer*) from the Sumatran form. 
This nomenclature (without considering Indo-Chinese forms) shows the 
relationship of the various races inhabiting the large land masses of Malaysia, 
i. e. the southern half of the Malay Peninsula, Sumatra, Borneo and Java. 
The two species are much alike in Malaysia; but generally speaking R. rajah 
is a brighter animal, more tinged with orange, with the bases of the dorsal fur 
and spines grey; while R. rajahis duller with the base of upper pelage brownish: 
its nasals also extend posteriorly beyond the frontopremaxillay sutures. 
2. Rattus rattus bali subsp. nov. 
A field rat: the upper pelage composed of hair with grey bases and slender spines 
with pale bases: long piles or bristles on the rump. Above grizzle of ochraceous tawny 
and brownish black, below creamy white often with traces of a median grey stripe: 
Forefeet brown, hind feet white, broadly brown mesially. 
Mammae 3— 3= 12. 
Co-types. Adult male and female (skins and skulls} from Laboean Amok 
and Kloengkoeng, Bali, collected 5 July and 1 May 1915. Nos. 99 and 100. 
Specimens examined. The co-types, three more from Kloengkoeng and 
two from Boeleling, Bali Island. 
Skull measurements of co-types: greatest length 44.2, 44; condylobasilar 
length, 39, 39; diastema, 12.1, 12.0; upper molar row (alveoli), 8.1, 8.0; combined palatal 
foramina, 7,8 X 3.5, 8.2 X 3.6; median nasal length, 16.0, 15.8; breadth of combined nasals 
5,0, 5.4; zygomatic breadth, 21, 21 mm. 
The skulls are robust with rather short broad rostrums, broad palatal foramina 
and large bullae, 
1) vide Ann. & Mag. Nat. Hist. (9) VII, 1921, p.p. 234—6. 
2) Robinsony op- cite, p23. 
3) Not hitherto recorded from the island unless perhaps as Mus jerdoni. 
