THOMAs: Rats and Shrews. 111 
This fine rat is named after Dr. DAMMERMAN, to whose kindness I 
owe the opportunity of working out this interesting Archipelago collection, 
The species has some resemblance to R. miilleri, JENT. but would appear 
to be really a large member of the R. rattus-neglectus group. Its mammæ 
are 3—3—12 in number, while R. milleri has only 2 — 2 —8. 
6. Rattus pesticulus, THOS. 
A dwarf member of the rattus-neglectus group. 
Size very small, hardly greater than in the concolor group. Fur thin and coarse, 
not definitely spinous. General colour above dull reddish brown, sides rather greyer, 
under surface sharply defined white, the hairs on the throat with grey bases. Hands and feet 
white. Tail of medium length, thinly haired, light brown, almost white basally. Mammæ 
3—3=12. 
Skull conspicuously smaller in all dimensions than in neglectus, but of about the 
same general proportions. Supraorbital beads distinct; no postorbital projections. Palatal 
foramina to the level of the front root of m!. Bulle of normal size. 
Dimensions of the type (measured on a stuffed specimen) :— 
Head and body 151 mm.; tail 148; hind foot 30; ear (no doubt shrunk) 13. 
Skull: greatest length 37.5; condylo-incisive length 36; zygomatic breadth 18; 
nasals 13; breadth across parietal ridges 14; palatilar length 18.5; palatal foramina 7,4; 
upper molar series 6.5. 
Hab. Menado, Celebes. 
Type. Adult female, B.M. no. 21.2.9.11. Temporary number 16. Collected 1908 
by Mohari. One specimen. 
This pygmy member of the rattus-neglectus group is an island analogue of the 
small S.-Indian R. r, wroughtoni and R. kandianus, but seems to deserve a special 
specific name. 
(Ann. and Mag. of Nat. Hist. Ser. 9, Vol. VII, March 1921, p. 248.) 
7. Rattus mordax, THOS. 
d 18. N. New Guinea. 
8. Rattus fratrorum, THOS. 
d 10. Amoerang, N. Celebes. 
Q 9. Menado, Leg. MOHARI. 
9. Rattus chrysocomus, HOFFM. 
Q 11. Juv. 31. Toradjalanden, Mamasa. 
In his large paper on the mammals of Celebes (Abh. Mus. Dresden. 
VII No. 7. p. 24, 1899.) Dr. A. B. MEYER has placed both chrysocomus and 
Jratrorum as synonyms of À. callitrichus, JENT., but all these are perfectly 
distinct, differing considerably in size and having quite appreciable diagnostic 
skull characters. 
10. Rattus hellwaldi, JENT. 
cd 13. Menado, N. Celebes. Leg. MOHARI. 
cd 12. 14. Amoerang, N. Celebes. 
11. Rattus musschenbroeki, JENT. 
d 15. Menado. Leg. MOHARI. 
