12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6l 



simalurensis and E. lugens of the Barussan Archipelago. The 

 Mimatran Mus miUlcri of Jentink, usually supposed to be a member 

 of the firmus group, is probably related to E. pannosus. Unfortu- 

 nately the absence of the auditory bullae in the type specimen makes 

 exact determination for the present impossible. 



EPIMYS TUA, new species 



Type. — Adult female (skin and skull), No. 196752, United States 

 National Museum. Collected on Maratua Island, Dutch southeast 

 Borneo, August 28, 1912, by H. C. Raven. Original No. 188. Pre- 

 sented by Dr. W. L. Abbott. 



Diagnosis. — Like Epimys ratlus neglect us of the Bornean main- 

 land but upperparts blackish brown and underparts slaty. 



Color. — The color in one adult and one young is essentially like that 

 of Epimys mar a. In the other two adults it is similar, except that 

 there is less of the isabella on back and sides and of the vinaceous- 

 buff on underparts. 



Skull and teeth. — The skull resembles that of Epimys neglectus. 

 It consequently differs from that of E. mara in its much smaller size 

 and normally formed nasals. Teeth as in E. neglectus. 



Measurements. — Type: head and body, 185 mm.; tail, 170; hind 

 foot, 39 (dry, 36, 35) ; condylobasal length of skull (teeth moderately 

 worn), 40.1 ; zygomatic breadth, 19.8; interorbital constriction, 6.1 ; 

 mastoid breadth, 16.1 ; depth of braincase, 11.0; nasal, 14.5 ; diastema, 

 11.6; mandible, 6.7; maxillary toothrow (alveoli), 25.3; mandibular 

 toothrow (alveoli), 6.8. 



Specimens examined. — Four, all from Maratua Island. 



Remarks. — The dark color of the upperparts and the dull, slightly 

 contrasted underparts immediately distinguish the Maratua form 

 from the other local races of the neglectus-group represented in Dr. 

 Abbott's and Mr. Raven's Bornean collections. 



EPIMYS RATTUS TURBIDUS, new subspecies 



Type. — Young adult female (skin and skull), No. 196746, United 

 States National Museum. Collected at Tanggarung, south bank of 

 Mahakam River, Dutch Southeast Borneo, June 21, 1912, by H. C. 

 Raven. Original No. 81. Presented by Dr. W. L. Abbott. 



Diagnosis. — Like Epimys rattits neglectus from southern Borneo 

 but color of underparts a dull drabby gray," inconspicuously contrasted 

 with that of sides. 



