302 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



Family ERINACEID^. 



PODOGYMNURA TRUEI Mearns. 



Specimen. — One, the type, from Mindanao: Mount Apo (Mearns). 

 Family SORICID^. 



PACHYURA LUZONIENSIS (Peters). 



Specimens. — One hundred and seventy-five, from the following 

 localities : 



Luzon: Malabon, 9 (Carpenter); Manila, 164 (Mearns, P. B. S., 

 Fox, Lewis) ; Porto Real, 1 (Lewis) ; San Fernando de Union, 1 (Lewis). 



There is an immense and most puzzling variation in size in the 

 large series of specimens from the vicinity of Manila Bay, but after 

 long study I am forced to believe that it is genuine individual variation 

 within a single species. Measurements, average and extreme, of the 

 hind foot, without claws, of 125 specimens from Manila is 18.8 (15-21.7) 

 mm. This almost unparalleled variation may be due to an admixture 

 of races from the shipping in the harbor, as PacJiyura is a well-known 

 rival of the house rat and house mouse about buildings, and has been 

 captured on vessels. Series of specimens from remote parts of Luzon 

 are much needed for comparison with the Manila specimens. 



In the following table of cranial and dental measurements, only 

 fully adult skulls, mth basal suture obliterated, or at least tightly 

 closed, are used. Even in the oldest specimens the teeth show com- 

 paratively little wear. 



Measurements of selected adult skulls of Pachyura luzoniensis from Manila. 



