Miller and Hollister — New Murine Rodents. 73 



tapering toward end ; antorbital plate weak and sloping, without squarish 

 angle. 



Measurements. — Type: Head and body, 172; tail, 190; hind foot, 41. 

 Skull of type: Condylobasal length, 40.2; palatal length, 22.5; zygomatic 

 breadth, 18.9; mastoid breadth, 15. S; interorbital breadth, 6.8; nasals, 18.1 

 X 5.8; width of rostrum in front of antorbital plate, 8.1; mandible, 24.0; 

 maxillary tooth row (alveoli), 7.8; mandibular tooth row (alveoli), 8.0. 



Specimens examined. — Five from the type locality, all collected above 

 6,000 feet. 



Remarks. — This large-snouted member of the chrysocomus group is very 

 different from all the related forms, with the exception of the species 

 described next below, also a highland form, which it resembles in many 

 features. 



Rattus sericatus, sp. nov. 



Type from Rano Rano (east of Lake Lindoe and north of Lake Poso), 

 Middle Celebes; about 6,000 feet altitude. No. 219,627, U. S. National 

 Museum ; skin and skull of adult male (teeth considerably worn) ; collected 

 December 19, 1917, by H. C. Raven; original number 3340. 



Diagnosis. — Like Rattus penitus, but darker, and with still longer, softer 

 pelage ; feet more fully clothed with whitish hairs, sharply contrasted with 

 dark brown of ankle. Skull with rostrum enlarged, but less thickened at 

 end, more tapering, than in penitus. 



Measurements. — Type: Head and body, 175; tail, 170; hind foot, 40. 

 Skull of type; Condylobasal length, 41.4; palatal length, 23.7; zygomatic 

 breadth, 19.5; mastoid breadth, 17.4; interorbital breadth, 6.9; nasals, 

 18.7 X 5.3; width of rostrum in front of antorbital plate, 8.5; mandible, 24.5; 

 maxillary tooth row (alveoli), 8.1; mandibular tooth row (alveoli), 7.8. 



Specimens examined. — Five from the type locality. 



Remarks. — This species, while obviously related to Rattus penitus, is 

 readily distinguished by its much longer, softer pelage and the less thick- 

 ened rostrum. Both species are large, high mountain forms of the chry- 

 socomus group, with white-tipped tails. 



Rattus rallus, sp. nov. 



Type from Gimpoe, Middle Celebes. No. 219,595, U. S. National Mu- 

 seum; skin and skull of adult 9 (teeth considerably worn) ; collected Sep- 

 tember 7, 1917, by H. C. Raven; original number, 3233. 



Diagnosis. — A member of the chrysocomus group resembling Rattus 

 nigellus, but smaller, with shorter hind foot, and much smaller teeth. Tail 

 dark above, light below. Skull with flatter, less arched braincase, longer 

 rostrum, and smaller auditory bullae. 



Measurements. — Type: Head and body, 145; tail, 130; hind foot, 32. 

 Skull of type: Condylobasal length, 35.8; zygomatic breadth, 18.3; mastoid 

 breadth, 15.3; interorbital breadth, 6.3; mandible, 20.3; maxillary tooth 

 row (alveoli), 6.3; mandibular tooth row (alveoli), 6.4. 



