no. 1809. MAMMALS FROM BORNEO AND VICINITY— LYON. 97 



Specimens examined. — Seven, all from Pulo Sebuku. 



Remarks. — Superficially the two species, R. vittata and R. vittatula, 

 appear identical, but the difference in size is absolutely constant, 

 and there is no doubt as to their specific distinctness. The light 

 coloring of the neck in R. vittatula is also constant. Both species are 

 clearly offshoots from the mainland R. ephippium. The smallness 

 of the Sebuku specimens was noticed by Doctor Abbott in the field. 



NANNOSCIURUS EXILIS (Miiller). 



1907. Nannosciurus exilis, Lyon, Proc. U. S. Nat. Mus., vol. 33, p. 558, December 

 24, 1907. 



One specimen collected at Sanggau in 1905. 



NANNOSCIURUS BORNEANUS Lyon. 



190(3. Nannosciurus borneanus Lyon, Proc. Biol. Soc. Wash., vol. 19, p. 54, May 



1, 1906. 

 1907. Nannosciurus borneanus, Lyon, Proc. U. S. Nat. Mus., vol. 33, p. 55S, 



December 24, 1907. 



Fourteen additional specimens of this species of pigmy squirrel were 

 secured, five from southeastern Borneo and nine from southwestern 

 Borneo. They differ in no essential respects from the original series. 



(For measurements and exact localities see table below. Three 

 specimens from Matan River and one immature individual from 

 Tjantung, all in alcohol, are not included in the table.) 



Measurements of -pigmy squirrels. 



i Collector's measurements. 2 Measured by writer after relaxing feet in water. 

 80796°— Proc.N.M. vol.40— 11 7 



3 In alcohol. 



