54 Lyon Pigmy Squirrels of Nannosciurus melanotis Group. 



color, irregularly lined with blackish. Top of head dull ochraceous, lined 

 with black. Feet dull ochraceous. Hairs of tinderparts slaty at base, dull 

 ochraceous buff at ends. Light head stripe whitish tinged with buffy, 2 

 mm. wide in front and 5 mm. wide under ear. Preorbital stripe black 

 1.5-2 mm. wide. Supraorbital halfring not distinct, about 1 mm. or less 

 wide, dull ochraceous buff. External surface of ears black, internal surface 

 similar to top of head. Postauricular spot black, not large, extending 1-2 

 mm. behind ear. Nape patch well denned, light cream to pinkish buff. 

 Hairs of tail ringed as follows: Dull ochraceous, blackish, dull ochraceous, 

 black, white, black. At tip of tail, after the second ochraceous ring, the 

 hairs are uniformly black. 



Skull. The skull of N. sumalranus shows no appreciable differences 

 from that of related species except N. pulcher which is slightly larger. 



Measurements. Type: Head and body, 83 ; tail vertebrae, 72; hind foot 

 with claws, 23.8. Skull: Gnathion to occipito-sphenoid suture, 15; great 

 est width, 15.8 ; interorbital constriction, 9.6 ; maxillary toothrow (alveoli), 4. 



Specimens examined. One, the type. 



Remarks. This is the Sumatran representative of the group. The single 

 specimen agrees closely with Mr. Miller's notes on the Padang specimen 

 in the Leyden Museum. It differs from the Javan specimens in having a 

 conspicuous nape patch, wide head stripe under the ear, and small post- 

 auricular spot, as well as in its general yellow brown instead of red brown 

 coloration. 



Nannosciurus borneanus sp. nov. 



Type.Mu\t female, skin and skull, No. 142,271, United States National 

 Museum. Collected in Sanggan, western Borneo, August 23, 1905, by Dr. 

 W. L. Abbott. Original number 4368. 



Characters. A yellow brown member of the group, with distinctly griz 

 zled back, and well marked, light colored nape patch, which, however, is 

 not so light nor distinct as it is in Nannosciurus pulcher or sumatranus. 



Color. Type: Upperparts and sides of body and outer sides of legs a 

 fine distinct, even grizzle of a light Isabella color tinged with olive, and 

 black. Top of head a grizzle of dull ochraceous and black. Hind feet a 

 dull hazel ; forefeet similar to back. Base of hairs of underparts slate 

 color; ends dull ochraceous buff. Head stripe, whitish, slightly tinged 

 with buffy, nearly 2 mm. wide in front and 5-7 mm. wide under the ear. 

 Preorbital stripe narrow, about 1 mm. wide, blackish, specked with ochra 

 ceous. Supraorbital halfring not well marked, 1 mm. or less, dull ochra 

 ceous. Internal surface of ears similar to top of head. External surface 

 of ears black. Postauricular spot black, extending 4-5 mm. behind ear. 

 .Nape patch well defined, dirty white, grayish posteriorly. Hairs of tail ringed 

 thus : dull ochraceous, blackish ochraceous, black, white, black. At tip 

 of tail, after the second ochraceous ring, the hairs are black to their ends. 



Skull. There are no constant characters by which the skull of Nannos 

 ciurus borneanus can be told with certainty from that of other members of 

 the group, except pulcher which has a slightly larger skull. 



