ACCOUNT OF A TRIP UP THE PAHANG, AND OTHER RIVERS. 4 1 



it from the river we dispensed with his services. PangHma 

 Garang YUSUF also left us at this point. 



At this camp we heard for the first time a most peculiar 

 noise which we at first attributed to horn-bills but subsequently 

 found to be produced by a large monkey, of what species we 

 were unable to determine, as although many attempts were 

 made to obtain specimens, we were entirely unsuccessful 

 owing to the extreme wariness of the monkeys. The cry 

 commenced with a series of deep sonorous barks which 

 gradually becoming quicker and shriller ended in a sort of 

 unearthly laugh and then commenced again. We frequently 

 heard these monkeys again up the Tahan valley. Here we 

 obtained our first specimens of the pretty little chestnut- 

 backed Forktail {Hydrocichla riificapillus), the bird which 

 frequents all the small rocky mountain streams and of which 

 a nest was subsequently obtained. The nest which is cup- 

 shaped is constructed of moss and lined with dead leaves and 

 built against the almost perpendicular face of a large rock 

 overhanging the water. For three nights in succession a 

 beautiful specimen of that glorious butterfly (Zeiixidia aureola) 

 crossed the river just below our camp at dusk, but unfortunate- 

 ly we did not succeed in capturing it. 



On the evening of the 21st, three of the boats which Mr. 

 Ridley had taken up-stream returned and we found that he 

 had only been able to reach a point about three miles up- 

 stream at the mouth of the Sungei Tenok beyond which 

 point the boats could not proceed owing to the bed of the 

 stream being choked up with boulders. In fact it was with 

 great difficulty that Mr. RiDLEY had succeeded in getting the 

 boats up thus far as the stream was exceedingly shallow and 

 much encumbered with fallen trees, and owing to having to 

 stop to make a channel for the boats, moving stones to either 

 side and cutting through fallen logs, it took the better part of 

 two days to accomplish this distance. 



On the 22nd the three boats were again started up-stream 

 with a second load of rice and other stores and fifteen men. 

 There was heavy rain during the evening and the river rose 

 some six or eight feet during the night, nearly washing away 



