20 DUTCH BORNEO-EXPEDITION. 



obtained, among them for example such animals as Sciurus 

 Whiteheadi, Calyptomena Uosei, and Mesolophus montis, 

 which were hitherto known only from Mount Kina Balu 

 and the higher mountains of Sarawak and which I had 

 not expected to find south of the Kapoeas plain. 



At the beginning of May a start was made with the 

 forwarding of the baggage back to Nanga Raoen , and on 

 May 5th. X left my lofty hunting grounds , on which I 

 had spent some of the most interesting months of my 

 journey. A few days later Dr. Hallier, who had stayed 

 with me for a short time in the Poenan Grotto , left 

 Borneo on account of persistent fever, and returned to 

 Java with rich botanical treasures. 



At Nanga Raoen, where, in the meantime, Dr. Nieu- 

 wenhuis had collected numerous fishes and butterflies for 

 me, I stayed a fortnight longer, to devote my attention 

 to the fauna of the Mandai valley. 1 then removed to 

 Poetoes Sibau , whither Dr. Nieuwenhuis had preceded 

 me, and where also Professor Molengraaff was expected, 

 in order to concert with us as to a journey to the Mahak- 

 kam River. As it proved, however, that this journey which , 

 if circumstances were favorable, was to be continued to 

 the East coast, could not be entered upon before the middle 

 of June, I was obliged to give up all idea of taking 

 part in it. 



In order to make the most of the time remaining to 

 me , I now proceeded with my entire establishment up the 

 Sibau River to Poelau , the only inhabited spot of the 

 entire Sibau valley, where I set up a new station. Here 

 I stayed for a month and, inter alia, I made a very ro- 

 mantic ten days' excursion up the river, the higher reaches 

 of which are extremely wild , and fairly abound in rapids. 

 The fauna of the Sibau valley does not differ from that of 

 the Kapoeas plain , and even the upper reaches did not yield 

 a single mountain form. Two months later, towards the 

 end of July, I left Borneo and returned by Singapore, 

 Deli (East coast of Sumatra) and Batavia to Holland. 



JNotes from tlie Lieyden IMuseum, V^ol. XIXl. 



