4 GYLDENSTOLPE, ON A COLLECTION OF MAMMALS MADE IN EASTERN AMD CENTRAL BORNEO. 



or Kayan river in the drainage of which it is situated. The remainder of the 

 collection was obtained in Central Borneo at the two places Poeroeok Tjahoe and 

 Toembang Maroewe mentioned above. 



During 1915 — 1916 Mr. Lumholtz undertook a long journey into the Central 

 parts of Borneo. The zoological collections formed during this journey have not 

 reached Europé, but in another paper I hope to be able to report on them. 



The notes on the Mammal collection has been accompanied by two appendices. 

 In one of these I have given a bibliography of the Mammalian literature about 

 Borneo since 1873, and in the other I have drawn up a nominal list of the Mam- 

 mals at present known to inhabit the mainland of Borneo. 



I herevvith take the opportunity to thank publicly Mr. Carl Lumholtz for 

 giving me the above-mentioned geographical informations. My thanks are also due 

 to the Authorities of the Zoological Museum in Christiania and chiefly to its former 

 Director, Professor Th. Odhner for having placed these valuable collections into 

 my hands for examination and determination. 



1. Hylobates mulleri miilleri Martin. 



Nat. Hist. Maram. Auim. 1841, p. 444. 



Camp 6, Eastem Borneo (2,000 feet): No. 57. ^ 13 /s 1914. Head and body: 459 mm. Hindfoot: 

 133 mm. Ear: 31 mm. — No. 50. $ 10 /i ä 1914. Head and body: 522 mm. llindfoot: 146 mm. Ear: 33 mm. — 

 No. 38. $ V2 1914. Head and body: 516 mm. Hindfoot: 135 mm. Ear: 35 mm. — No. 28 $ 2 % 1914. 

 Head and body: 514 mm. Ear: 33 mm. — No. 32. $ 7-' 1914. Head and body: 446 mm. Ear: 32 mm. — 

 No. 24. <$ 2 % 1914. Head and body: 464 mm. Hindfoot: 135 mm. Ear: 33 mm. — No. 51. $ inim. 

 10 / 2 1914. Head and body: 356 mm. Ear: 33 mm. — No. 39. <£ imm. */a 1914. — No. 23a (skull only 

 witliout date and sex). 



Camp 5, Eastem Borneo: No. 21. $ - 3 /i 1914. Head and body: 504 mm. Hindfoot: 146 mm, 

 Ear: 32 mm. — No. 22. £ imm. 23 /i 1914. Head and body: 346 mm. Ear: 29 mm. 



Camp 3, Eastem Borneo: No. 71. J 1 i9 /a 1914. Head and body: 494 mm. Hindfoot: 139. Ear: 

 31 mm. 



Camp 1, Eastem Borneo: No. 17. <£ 21 /i 1914. 



Kaboerau, Eastem Borneo; No. 5. $ imm. 10 /i 1914. Head and body: 343 mm. Hindfoot: 118 

 mm. Ear: 36 mm. 



Toembang Maroewe, Central Borneo: No. 27. J 1 27 /io 1915. — No. 28 a. $ 27 /n> 1915. — No. 29. 

 ? juv. 2 7io 1915. — No. 23. $ juv. 20 /iu 1915. 



No locality or date: No. 22 a. J 1 (skull only)." — No. 58 <£ (skull only). 



The whole series of Gibbons clearly belongs to H. mulleri as described by 

 Martin (tom. cit.) The type was obtained in southern Borneo, but is without any 

 exact locality. The typical Hylobates mulleri has the crown blackish and the lower 

 back is generally much lighter and almost »mummy brown» (Ridgway, Col. Stånd. & 

 Nom. pl. 15) which colour is spread to the upper parts of the arms. The underparts 

 are almost pure black. The immature specimens in the present series are more blackish 

 than the adults, and the amount of the mummy brown colour seems to increase in 

 very old specimens becoming somewhat paler and more drab. 



The Gibbons are very variable as to the colouration, and among the specimens 

 from Borneo two colour varieties are also found, though specimens belonging to 



