110 TREUBIA VOL. Il, 1. 
camp there for several days. The top of the mountain was covered with 
small forest trees, and the usual undergrowth which, owing to the fact that 
they were able to get water, many small mammals had taken advantage of.” 
The species species of the group found in N. Celebes are now four 
in number, namely 
Rattus dominator, THOS. 
Largest. Skull about 56 mm. in total length. Fur without specially 
elongated piles. Incisors opisthodont. Skull with long tapering nasals, 
projected zygomatic plate and short palatal foramina. | 
Rattus xanthurus, GRAY. 
Rather smaller. Skull about 50 mm. in length. Back with elongated 
piles. Incisors orthodont. Skull with heavy supraorbital ridges, little projected 
zygomatic plate, and large palatal foramina. 
Rattus celebensis, GRAY. 
Size as last. Fur comparatively short, without longer piles. Skull 
with light ridges, short zygomatic plate and small palatal ONE, 
Rattus marmosurus, THOS. 
Again smaller. Skull 45 mm. Fur very long and trespassing on to 
the base of the tail. Ridges of medium development; zygomatic plate 
short; palatal foramina large; molars small. 
A fifth species with a white-ended tail is Rattus callitrichus, JENT., 
but this does not appear to belong to quite the same group. Its fur is soft, 
and more like that of Rattus fratrorum. Length of skull about 50 mm. 
Bulle small, much smaller then in the xanthurus group. 
5. Rattus dammermani, THOS. 
A large harsh-furred rat of the rattus-neglectus group. Mamme 3—3=12. 
Size about as large as in R. mülleri. Fur exceedingly poor, harsh, and thin, with 
hardly any underfur, the chief part of the pelage formed by the numerous narrow spinous 
hairs. General colour above rufous-brown, the spiny hairs whitish at base, with dark 
brown tips. Under surface dull whitish, fairly sharply defined, the hairs light to their 
bases; middle line of chest faintly darker. Limbs more reddish brown, hands and feet 
whitish. Tail long, short-haired, uniformly brown. Mamme 3—3=12. 
Skull strongly built, elongate, with long narrow nasals, strongly developed supra- 
orbital ridges, which sweep evenly round to the outer corners of the interparietal 
without forming any postorbital process or angle. Zygomatic plate strongly convex, 
Palatal foramina long, reaching past the level of the front root of ın!, Bulle fairly large, 
Incisors orthodont. Molars proportionally small. 
Dimensions of the type (measured on a stuffed specimen) :— 
Head and body 206 mm.; tail 252; hind foot 43; ear (no doubt shrunk) 17. 
_ Skull: greatest length 50; condylo-incisive length 48; zygomatic breadth 25; nasals 
19.7; interorbital breadth 7.3; breadth across parietal ridges 15.8; zygomatic plate 6; 
palatilar length 24; palatal foramina 9.1; postforaminal palate 10.1; upper molar series 8. 
Hab. (of type). Wadjo, N. Celebes, at the N. W. corner of the Gulf of Tomini, 
Type. Adult female. B, M. no. 21.2,9.7. Original number 105. Collected 12th April, 
1915, by the Dutch Controleur. Presented by the Buitenzorg Museum. One specimen. 
(Ann. and Mag. of Nat. Hist. Ser. 9, Vol.VII, March 1921, p. 247.) 
