442 



rROCEEDINGS OF THE NA TIONAL ^WSEUM. 



VOL. XXVIII 



tail, larger oars, and an admixture of grooved spines in the pelage of 

 the upper surfa(H^„ Eight caudal annuli to the centimeter on middle 

 of tail (two less than in Scandinavian specimens of Mas norveglcuH)\ 

 longest whiskers reaching beyond tips of extended ears. 



Color. — Like that of the gra}^ rat of Norway, but with pelage less 

 dense, and perhaps a trifle paler. 



Skull and teeth. — Skull heavily ossified; temporal fossa smooth; 

 l)raincase smooth and flattened above, the region included between the 

 su])raorbital ])eads narrow and triangular as in Mux. iiorvegicus,' anteor- 

 l)ital region broad and elevated; rostrum greatly thickened; nasals 

 ])road, obtusely pointed posteriorly, ending opposite fronto-maxillary 

 suture; audital bulhe flattened and ))roadened; teeth similar to those 

 of M. lior regions. 



Cranial measurements of the type, an adult female, from Zamboanga, Mindanao. 



Measurement. 



Basilar length ( Hensel) 



Occipi to-nasal length 



Intrri>aTietal lireadth (from outer edge of beaded upper margins) 



Leiigtli of internasal suture 



Greatest width of rostrum 



Length of upper toothrow 



No. 12.5212, 



U.S.N. M., 



type. 



39 



46 



13 



18 

 9.3 

 7.5 



External measurements of the type and of an adult male from Zamboanga, Mindanao. 

 [Taken from fresh specimen.] 



Measurement. 



No. 125212, 



U.S.N. M., 

 type. 



No. 125211, 

 U.S.N.M. 



Length 



Tail vertebraj 



Hind foot 



Head 



Ear above erown. . . 

 Ear above notch . . . 

 .Tail to end of hairs 



Specim.ens examined. — The type and one topotype. 



MUS MINDANENSIS, new species. 



mm. 

 420 

 201 



43 



56.5 



18 



21.5 



MINDANAO SPINY RAT. 



Ree'-a,h (Moros of Pantar). 



Umt/-bongh Hah-wee'-lee (Bagobos of Todaya). 



7}//>t^.— Adult male (skin and skull), Cat. No. 125274, U.S.N.M. 

 Collected at Todaya, altitude 4,000 feet, Mount Apo, southern Min- 

 danao, July 9, 1904, by Edgar A. Mearns. (Original number. 5719.) 



Chairtcters. — A large member of the rattus group. Whiskers 

 reaching to shoulders; tail concolor; upper pelage quite thickly mixed 



