Lyon Pigmy Squirrels of Nannosciurus melanotis Group. 55 



Measurements. Type : Head and body, 86 (75-90) ; * tail vertebrae, 65 

 (64-70); hind foot with claws, 22.6 (22-23.9). Skull of type: Greatest 

 length, 25.3; basal length, 20; basilar length, 19.2; palatal length, 12.1; 

 greatest breadth, 16.8 (14.9-16.8); gnathion to occipito-sphenoid suture, 

 15.6 (14.7-15.6); interorbital constriction, 10.6; greatest breadth of brain- 

 case, 14; nasals (median edge), 11; maxillary toothrow (alveoli), 3.8; 

 mandible (condyle to front of symphysis), 14; mandibular toothrow (al- 

 yeoli), 3.6. 



Specimens examined. Ten males and one female, all from western Borneo, 

 near the coast. 



Remarks. The type specimen represents the series very well ; a few of 

 the specimens are more ochraceous in the underparts and some have ir 

 regular tinges of buffy or vinaceous buffy in the nape patch or on the 

 posterior part of the light head stripe, but never so much as in the Pigmy 

 Squirrel from Banka. Nannosciurus borneanus is easily distinguishable 

 from N. pulcher and sumatranus by its conspicuous fine grizzle, and from 

 melanotis and bancanus by its lighter color and clear and distinct nape 

 patch. 



Nannosciurus bancanus sp. nov. 



Type. Skin and skull of adult female, No. 124,880, United States Na 

 tional Museum. Collected at Klabat Bay, Island of Banka, east of Sumatra, 

 June 24, 1904, by Dr. W. L. Abbott. Original number 3430. 



Characters. Most like Nannosciurus borneanus, from which it differs in 

 its generally darker color, more obscured nape patch and buffy face stripes. 



Color. Type : Upperparts and sides of body, and outer surfaces of legs, 

 a fine grizzle of a color between Ridgway's tawny-olive and raw umber, 

 and black, the former color in excess. Top of head dull tawny ochraceous 

 grizzled with black. Underparts, including inner side of legs, with the 

 hairs slaty at base, and ochraceous buff for the rest of their length. Fore 

 feet similar to back ; hairs of hind feet dull tawny. Light face stripe, 

 about 1 mm. wide at nostril, 5 mm. wide beneath ear, generally buffy in 

 color ; for the first 2 or 3 mm. just behind nostril it is ochraceous buff and 

 under the ear it inclines toward vinaceous buff. Preorbital stripe narrow, 

 black, and slightly sprinkled with tawny. Supraorbicular halfring incon 

 spicuous, dull ochraceous buff, scarcely 1 mm. wide. 'External surface of 

 ears black ; postauricular spot black ; extending about 4 mm. behind ear. 

 Internal surface of ear similar to top of head. Nape patch distinctly pres 

 ent, but not clear, a dark, dull pinkish buff of Ridgway, irregularly lined 

 with blackish. Hairs of tail ringed as follows: dull ochraceous, blackish, 

 ochraceous, black, white, black. At tip of tail the hairs are uniformly 

 blackish after the second ochraceous ring. 



Skull. The skull of Nannosciurus bancanus shows no characters by which 

 it can be distinguished from that of other species, except from N. pulcher 

 which has a larger skull. 



* Figures in parentheses are those of the extremes of the series. 



