SCIURUS SERAIÆ sp. nov.
Type.—Adult male (skin and skull) No. 104660 U. S. National Museum. Collected on Pulo Seraia, South Natuna Islands, May 29, 1900. Original number 415.
Characters.—Most nearly related to the small, pallid, Sciurus lutescens from Sirhassen Island, but upper parts slightly less pale, and under parts and pale side stripe buff-yellow, the former without admixture of gray.
Color.—Upper parts as in Sciurus lutescens except that the pale bands on the hairs are more nearly buff than cream-buff. Tail essentially as in S. lutescens but a shade less pale. Under parts buff-yellow darkening irregularly to dull orange-buff. Dark side stripe broad and well defined.
Skull.—The skull closely agrees with that of Sciurus lutescens in both size and form, though it is perhaps even broader in proportion to its length. Teeth as in S. lutescens.
Measurements.—External measurements of type: total length 368; head and body 197; tail vertebræ 171; hind foot 44 (40). Average and extremes of four specimens from the type locality: total length 347 (323-368); head and body 184 (171-197); tail vertebræ 163 (152-171); hind foot 43.7 (43-45); hind foot without claws 40.1 (39.5-41).
Cranial measurements of type: greatest length 45; basal length 38.6; basilar length 36; zygomatic breadth 26.4; least interorbital breadth 17; mandible 28; maxillary toothrow (alveoli) 8.6; mandibular toothrow (alveoli) 8.6.
Specimens examined.—Four, all from the type locality.
Remarks.—As might be expected from the geographic position of the island it inhabits, Sciurus seraiæ differs from the Bornean S. notatus in much the same way as the Sirhassen representative of the group. It is readily distinguishable from the Sirhassen animal by the different color of the under parts. In color Sciurus seraiæ closely resembles S. abbottii of the Tambelan Islands. The latter is, however, a much larger animal, with a longer and relatively narrower skull.