On Mammals from the Batu Islands. 137 



XXI. — On a Collection of Xrammals from the Batu Islands, 

 tcest of Sumatra. By MarcUS W. Lyon, Jun., United 

 States National Museum. 



I HAVii been asked by the authorities of the British Museum 

 to work out and compare with the specimens obtained by 

 Dr. Abbott a small series of mammals from tlie Batu Islands, 

 which liad been collected by i\Ir. Kannengieter and purchased 

 by that Institution. 



Dr. Abbott's specimens from the islands were described 

 by Mr. Genit S. Miller, and most of the Kannengieter 

 examples are referable to forms named by him. There is, 

 however, among them a new species of flying-lemur. 



Sciurus tctericus, Miller. 



Tiie adult female from Tana Massa and the adult male 

 simply niHiked " Batu Islands " differ in no respects from 

 the original series of Sciurus ictericus, Miller (Smithsonian 

 Miscall. Coll. xlv. p. 12, November 6, 1903), the type of 

 which came from Tana Bala. 



Ratifa jnniensis, Miller. 



The two brown giant squirrels from Pulo Pini (or Pinie) 

 are typical of liafufa piniensis, Miller (Smithsonian Miscell. 

 (^oU. xlv. p. 8, November 6, 1903). 



Ratufa massoi, Miller. 



The pair of brown giant squirrels from Tana Massa are 

 typical of Ratufa massa', Miller (Smithsonian Miscell. Coll. 

 xlv. p. 7, November (5, 1903). 



Ratufa palUata, Miller. 



The three sjjecimens from Tana Massa are not quite 

 typical, but too close to be separated satisfactorily. The 

 hind feet (with claws 76-81 nnn.) average somewhat smaller 

 than they do in li. palliata (see table of measurements, Lyon, 

 Proc. U.S. Nat. I\lus. xxxii. p. 445, May 23, 1907), 80-90 mm., 

 but have about the same size as they do in A', lanata, Miller 

 (Proc. U.S. Nat. ]\lus. xxvi. p. 4^1, February 3, 1903), 

 72-79 mm. The skulls of the three Tana Massa specimens 

 are a trifle shorter as to total length than skulls of similar 

 age from Sumatra. The arrangement of the nasals and the 

 prcnu\xillai is not different from that found in Ratufa palliata. 



