no.1757. NEW PHILIPPINE MAMMALS— MILLER. 397 



(16.8); mastoid breadth, 13.2 (14.0); breadth of brain case, 1 1.0(11.2); 

 postorbital constriction, 5.0 (5.0); interorbital constriction, 8.0 (8.8); 

 mandible, 18.6 (19.8); maxillary tooth row, 10.6 (11.2); mandibular 

 tooth row 12.0 (12.8). 



Specimens examined. — Three, one from Mindanao, the others from 

 Pandon, Albay, Luzon (collected by 1). B. Mackie). 



EPIMYS TYRANNUS, new species. 



Plate lit. 



Type-specimen. — Adult male (skin and skull). No. 8, P. B. S., 

 Ticao, May 15, 1902. R. C. McGregor and A. Celestino, ((.Heelers. 



Diagnosis. Size essentially as in Epimys imperator Thomas, of the 

 .Solomon Islands, the largest known member of the genus, but skull 

 not differing conspicuously from that of Epimys norvegicus in form. 



External character. General external form, including size of ear, 

 relative lengths of tail and head and body, lengths of palm and sole, 

 of digits, and claws, about as in Epimys norvegicus. Tail essentially 

 naked, sparsely sprinkled with stiff hairs about 2 mm. in length 

 which nowhere form any approach to a hairy covering; annulations 

 well defined, about 7 to the centimeter at middle of tail, their distal 

 margins closely appressed. Palm and sole naked, the tubercles 

 essentially as in Epimys norvegicus, but slightly larger in proportion 

 to area of region which they occupy; a small but well-developed sec- 

 ondary wart at outer side of the plantar tubercle at base of both first 

 and fifth toes; postero-external plantar tubercle long, its greatest 

 diameter about 21 times that of sixth. Fur coarse, harsh, and stiff, 

 though nowhere actually spinous; the underfur thin, the longer hairs 

 for the most part slender grooved bristles, those of middle of back 

 about 15 mm. in length; rump and lumbar region with rather con- 

 spicuous growth of coarse terete hairs about 00 to 75 nun. lone,-. 



Color. — Whole animal a. dull indefinite brown somewhat interme- 

 diate between the wood brown and broccoli brown of Ridgway, the 

 median dorsal region from between eyes to base of tail with a darker 

 tinge (about Mars brown), the sides of shoulders suffused with drab, 

 the undei parts tinged with dull buff; a faintly indicated dark area 

 around eyes; cheeks and muzzle dull fawn color; whiskers black in 

 rather noticeable contrast; feet a dull, indefinite brown not contrast- 

 ing with body: tail blackish through basal half, then whitish to tip. 



Skull. Except for its much greater size the skull does not differ 

 conspicuously from that of Epimys norvegicus. Supraorbital bead 

 well developed, perhaps relatively higher than in Epimys norvegicus, 

 continued backward as a. conspicuous lateral ridge alone,- side of 

 brain case to outer margin of interparietal, where it joins lambdoid 

 crest; lateral ridges converging posteriorly, the distance between 

 them at point of crossing suture between frontal and parietal greater 



