96 Proceedings of the Biological Society of Washington. 



the outer tubercle of the succeeding lamina than with that of its own lamina ; 

 x-cusp small, and no corresponding cusp on inner tubercle of first lamina ; no 

 small postero-external cusp in m^. 



Measurements. — Type: Head and body, 235 mm.; tail, 280; hind foot, 

 45. Skull of type: Greatest length, 53.6; condylobasal length, 52.0 

 palatal length, 29.5; zygomatic breadth, 27.0; interorbital breadth, 7.4 

 mastoid breadth, 18.8; mandible, 33.8; maxillary toothrow, alveoli, 11.5 

 mandibular toothrow, alveoli, 10.8. 



Specimen examined. — One, the type. 



Remarks. — The Middle Celebesian form of Lenomys appears to be 

 specifically distinct from Lenomys meyeri and Lenomys callitrichus (Jentink), 

 both from Menado. The two northern species have the tail described as 

 shorter than head and body. 



Rattus dominator camurus, subsp. nov. 



Type from Pinedapa, Middle Celebes. No. 219,566, U. S. National 

 Museum; skin and skull of adult cf (teeth moderately worn); collected 

 January 15, 1918, by H. C. Raven; original number 3384. 



Diagnosis. — Like Rattus dominator dominator Thomas, of North Celebes, 

 but more grayish, less brownish, in color; skull with smaller auditory bullae. 



Measurements. — Type: -Head and body, 235 mm.; tail, 257; hind foot, 

 51. Skull of type: Greatest length, 59.1; condylobasal length, 55.3; 

 zygomatic breadth, 27.2; interorbital breadth, 7.7; mastoid breadth, 20.4; 

 mandible, 34.7; maxillary tooth row, alveoli, 10.2; mandibular toothrow, 

 alveoli, 9.1. 



Specimens examined.— Seven, all from Middle Celebes: Laboea Sore, 2; 

 Pinedapa, 4; Toware, Bada, 1. 



Remarks. — This is the Middle Celebesian race of Rattiis dominator 

 Thomas. It is very much like the typical form, which is represented in the 

 Raven collections by large series from North Celebes, but averages grayer 

 in color. The skull is like that of true dominator but with considerably 

 smaller auditory bullae. 



Rattus facetus, sp. nov. 



Type from Goenoeng Lehio (southwest of Lake Lindoe), Middle Celebes; 

 above 6,000 feet altitude. No. 218,677, U. S. National Museum; skin and 

 skull of adult 9 (teeth moderately worn); collected January 15, 1917, by 

 H. C. Raven; original number 3092. 



Diagnosis. — Like Rattus marmosnrus Thomas, of Mount Masarang, 

 Minahassa, but much smaller, with more hairy tail. Skull as in marmo- 

 snrus but smaller, with much smaller auditory bullae; and smaller, more 

 slender, incisor teeth. 



Measurements. — Type: Head and body, 135 mm.; tail, 175; hind foot, 

 33. Skull of type: Condylobasal length, 32.5; zygomatic breadth, 16.4; 

 interorbital breadth, 5.3; mandible, 21.2; maxillary toothrow, alveoli, 6.8; 

 mandibular toothrow, alveoli, 7.1. 



Specimen examined. — One, the type. 



Remarks. — Except for minor differences, as enumerated above, this 



