no. 1757. NEW PHILIPPINE MAMMALS— MILLER. 403 



Diagnosis. — Size noticeably greater than in the Mindanao species 

 (hind foot 32.2, condylobasal length of fully adult skull about 35 

 mm.); underparts grayish instead of buffy. 



Color. — Upper parts wood-brown, a little darker than that of 

 Ridgway, clearer and less dark on shoulders, cheeks, and sides of 

 neck, darker and with a rusty tinge posteriorly; face and crown to 

 between ears grayish though not in evident contrast; underparts 

 pale smoke gray with a bully cast, wrists and ankles hair-brown; 

 forefeet dull whitish; hind feet whitish mixed with hair-brown; 

 tail dusky throughout, lighter below than above. 



Skull a ml teeth. — Except for their noticeably greater size the skull 

 and teeth do not differ appreciably from those of Apomys insignis. 



Measurements. — Type: Head and body, 143 mm.; tail, 144; hind 

 foot (dry), 32.2; skull (teeth moderately worn), condylobasal length, 

 34.8; zygomatic breadth, 17.2; interorbital constriction, 6.0; breadth 

 of brain case over roots of zygomata, 14.S; depth of brain case at 

 middle, 10.0; nasal, 15.0; diastema, 10.2; mandible, 21.4; maxillary 

 tooth row (alveoli), 6.2; mandibular tooth row (alveoli), 6.0. 



Specimens examined. — Four, all from the type-locality. 



APOMYS MUSCULUS, new species. 

 Plate 19. 



Type-specimen. — Adult female (skin and skull), Cat. No. 145770, 

 U.S.N.M. Collected at Camp John Hay, Bagnio, Benguet, Luzon 

 (altitude 5,000 feet), May 6, 1007, by Dr. Edgar A. Mearns. Original 

 number, 6409. 



Diagnosis. — Size much less than in any of the other known species 

 (hind foot about 20 mm., condylobasal length of skull about 22.5 mm.) ; 

 color essentially as in the buff-bellied Mindanao forms. 



Color. — Entire body and head ochraceous-bulf, clear and rather 

 light on sides; cheeks and under parts tinged with ochraceous-rufous 

 and slightly clouded with black above; face slightly grayish; feet 

 bully gray, not conspicuously different from underparts; tail ob- 

 scurely bicolor, brownish above, whitish below. 



Skull and teeth. -Aside from its much smaller size the skull differs 

 from that of other known members of t ho genus in its relatively 

 somewhat larger and more globular brain case, more abruptly con- 

 stricted interorbital region, and more nearly vertical anterior border 

 of plate forming outer wall of infraorbital canal. Other features of 

 skull strictly as in the larger species. The teeth show no peculiarities 

 apart from their small size. 



Measurements. — External measurements of type: Head and body. 

 86 mm.; tail (imperfect), SO; hind foot (dry), 10.6. Young adult 

 male from the type locality: Hind foot (dry), 21. Cranial measure- 

 ments of type (teeth moderately worn): Condylobasal length, 22.6; 

 zygomatic breadth, 13.0; interorbital constriction, 4.0; breadth of 



