242 



CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



Measurements of Skulls. 



Nesoryzomys narboroughi new species. 



Type, adult male, No. 2470, Leland Stanford Junior 

 University Zool. Coll.; Narborough Island, April 3, 1899. 

 Range. — Narborough Island (Hopkins Expedition). 



Specific characters. — Similar to N. indefessus but larger, feet and ears 

 especially larger, the former 31 mm. or greater in length; coloration much 

 darker above, chiefly blackish mixed with some rusty brownish, below darker 

 gray. 



Coloration. — Above blackish, much mixed with rusty and yellowish brown, 

 sides becoming more yellowish brown; below drab-gray, the hairs plumbeous 

 at the base; sides of head like sides of body, a blackish spot below eye; fur 

 bordering the lips white; tail above dusky black, below drab-gray like the 

 belly; feet white, ears thinly covered externally with brownish hairs. 



Cranial ^>^ara^/^rj.— Skull like that of iV. indefessus but distinguishable by 

 the considerably greater width, longer nasals, and shorter palatal foramen. 



Measurements. — Type, adult male: Total length 303 mm., tail vertebrae 

 131 mm., hind foot 33 mm., ear 23 mm. Average of the three adult males: 

 Total length 292 mm., tail vertebrae 124 mm., hind foot 32 mm., ear 23 mm. 



This species was found inhabiting the cracks and fissures 

 in barren black lava fields near the coast of Mangrove 

 Point, Narborough Island. Individuals were rather scarce 

 at this locality, perhaps owing to the paucity of the vege- 

 tation. The contents of several stomachs were examined 

 and found to contain a reddish material resembling pulver- 

 ized Crustaceae. 



