126 MILLER 



both size and form, though it is perhaps even broader in proportion to 

 its length. Teeth as in S. lutescens. 



jMeasuremeiits. — External measurements of type : total length 368 ; 

 head and body 197; tail vertebrse 171 ; hind foot 44 (40). Avei^age 

 and extremes of four specimens from the type locality : total length 

 347 (323-368) ; head and body 1S4 (171-197) ; tail vertebrae 163 

 (152-171) ; hind foot 43.7 (43-45); hind foot without claws 40.1 



(39-5-40 • 



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; mandib- 

 ular toothrow (alveoli) '$>.6. 



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



Remarks. — As might be expected from the geographic position of 

 the island it inhabits, Sciurzis seraice differs from the Bornean 6". 

 7iotaius 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 seraice closely 

 resembles S. abbottii oi the Tambelan Islands. The latter is, however, 

 a much larger animal, with a longer and relatively narrower skull. 



SCIURUS RUTILIVENTRIS sp. nov. 



Type. — Adult male (skin and skull) No. 104658 U. S. National 

 Museum. Collected on Pulo Midei (Low Island), South Natuna 

 Islands, May 24, 1900. Original number 405. 



Characters. — Size slightly greater than that of Sciurus lutescens 

 and S. seraice.^ but not equal to that of the Bornean or Bunguran rep- 

 resentatives of 6*. fiotatus. Color above as in S. seraice. Under 

 parts bright clear orange-rufous. 



Color. — Color exactly as in Sciurus seraice except that the pale 

 side stripe is light cream-buff and the under parts are bright orange 

 rufous. Tail without trace of red suffusion. 



Skull and teeth. — The skull and teeth are a trifle larger than in 

 Sciurus lutescens and 6". seraice., but the difference is scarcely a 

 tangible one. 



Measurem^ents . — External measurements of type : Total length 

 368; head and body 190; tail vertebrae 178; hind foot 45 (41). 

 Average and extremes of seven specimens from the type locality : 

 total length 356 (330-368) ; head and body 186 (178-190) ; tail 

 vertebrae 173 (165-184); hind foot 45.5 (43-48); hind foot without 

 claws 42.2 (39.5-45). 



