ON MAMMALS FROM EAST-SUMATRA. 49 



In Dr. Hagen's collections are several Mammals hitherto 

 not recorded from Sumatra , but known from Borneo , f. i. 

 Arctogale stigmatica , Hemigalea derbyana , Herpestes bra- 

 chyurus , Cynogale bennettii , Ptilocercus lowii and Rhizo- 

 mys dekan. 



Leaving the bats out of consideration we see that the 

 more our knowledge increases the more the uniformity of 

 the Borneo- and Sumatra-fauna comes to light, but at the 

 same time it appears that the Mammalian Fauna of East- 

 Sumatra agrees much more with the Borneo- than with 

 the West-Sumatra Fauna. West-Sumatra has several spe- 

 cies hitherto not found in East-Sumatra and Borneo, so 

 Borneo has several species not recorded from West-Suma- 

 tra, but with two or three insignificant exceptions East- 

 Sumatra has all its Mammals in common with Borneo, 

 meanwhile none of the above named characteristic species 

 in Hagen's collection from Deli has been found in the 

 tolerably well known Western half of Sumatra. Dr. Hagen 

 observed in Deli, besides the species enumerated below and 

 the above mentioned Simia satyrus , the following species : 

 Felis tig ris , n. i. Rimau or Harimau\ Felis pardus, var. 

 melas , n. i. Rimau kombang; Ursus malayanus , n. i. Bruang ° 

 Sorex sp. ? aud Mus sp. ? n. i. Tikus. With five exceptions 

 all the Mammals, collected by Dr. Hagen, are from Deli, 

 Serdang, Tandjong-Morawa; one is from the Toba-plains, 

 and four are from Bengkalis and Siak, the two latter lo- 

 calities opposite Singapore. 



Simiae* 



1. Hylobates syndactylus Cuvier. 



Tandjong-Morawa, Marolam and Bander Labuan. n. i. 

 Imbau, rarely Siamang. 



Hab. Sumatra and perhaps nowhere else, as the locali- 

 ties, Southern Tenasserim and Malayan Peninsula, given 

 by Heifer and Wallace are very doubtful. 



Notes from the Leydeia Museum, Vol. XI. 



