440 



PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvm. 



External iiwasiiroiieiilx, thr lypc. 



Measurement (from fresh specimen). 



Total length 



Tail vertebrte 



Tail to end of hairs 



Hind foot 



Head 



Ear above crown .. 

 Ear above notoh... 

 Longest whiskers. . 



No.l252(il, 



U.S.N. M., 



type. 



26(1 

 2(il 



M 

 23 

 2S 



Coviparaiive measurements of three species of the Mas xanthurus grotip. 



Type of 



3/m.s evtr- 



etti. 



Type (No. 

 V2b'>(>i) of 

 Mus tayu- 

 layensis. 



Type (No. 



12525«) of 



Mas albiyu- 



laris. 



Length of head and body 



Length of tail 



Length of fore foot 



Length of hind foot 



Length of a long hair on back 



Length of skull 



Length of series of upper molars 



Length of first upper molar 



Distance between incisors and first molar 



mm. 

 216 

 188 

 25.40 

 48.80 

 42. 32 

 .50. 80 

 9.17 

 4.23 

 14.11 



mm. 

 262 

 260 



20. 40 



ryl 



42 



54 



10.10 

 4.20 



14. 50 



m7n. 

 260 

 236 



27 



52 



65 



54 



10. 2 

 4.50 



14 



MUS ALBIGULARIS, new species. 

 WHITE-THROATED WHITE-TAILED RAT. 



Oom-hough' Kah-rvee' -lee (Bagobos of Todaya on Mount Apo). 



Type.—kAwM male («kin and skull), Cat. No. 125258, U.S.N.M. 

 Collected on Mount Apo at 7,600 feet altitude, southern Mindanao, 

 Philippine Islands, July 3, 1004, by Edcvar A. jNIearns. (Original 

 number, 5699.) 



Characteri^. — Pelage softer, longer, and much denser than that of 

 Mus ii'anthurus J. E. Gray and M. everetti (xiinther, with much fewer 

 spines; terminal two-thirds of tail whitish; size smaller than M. 

 xanthurm^ with ears relatively smaller. Mamnue 4 pairs — 2 pectoral 

 and 2 inguinal. 



Color. — Upperparts yellowish brown (general effect mummy brown), 

 the pelage slate-gray at base except for a mixture of whitish spines, 

 darkest in the vertebral area; sides drab-gray, strongly mixed with 

 raw uml)er, with which many ol the hairs are tipped; uuderparts 

 white; feet mouse gray, with toes grizzled white, and claws horn 

 color; ears dral)-gray, fleshy within. The young are mouse gray 

 a])ove, wdiite below, with more or less brown and russet colors added 

 to the upperparts with increasing age. 



Shxdl and teeth. — Closely resembling those of Mun a'cmtluirus. The 

 teeth are not quite so simple as those of the Mus rattus group, there 



