DUTCH BORNEO-EXPEDITION. 149 



Poetoes Sibaii N"s 1 — 25 (May 16tt— June 9^^ 1896). 



Long Bloc River (a southern tributary of the Upper 

 Mahakkam) Nos 26—81 (September 10th— October 

 26th 1896); Nos 94—98 (November 12th_23'-d 1896); 

 Nos 121 — 127 (December 10th_-20th 1896); N^b 138 — 

 145 (January 26th_May 10th 1897). 



Briiny River (a southern tributary of the Long Bloe 

 Eiver) Nos 99—116 (November 27th_December 16th 

 1896); Nos 128 — 137 (Jauuary 16th — 25th 1897). 



Lower Iflahakkain River Nos 146 — 174 (May 10th— 

 25th 1897). 



This collection vs'as accompanied by a journal from the 

 hand of Mr. von Berchtold, with a number of interesting 

 field-notes which are made use of in the present paper, 

 with the exception of the vernacular names. These latter, 

 as a rule, have not the value ascribed to by several authors, 

 as they very often are untrustworthy and misleading. It 

 happens not seldom that one and the same name is be- 

 stowed upon several species (manau tana ^ ground-bird on all 

 the species of Pitta and some other terrestrial birds) or 

 that quite different names, even in the same places and 

 by the same people, are in use for one and the same 

 species. 



A very large and important bird-collection has been 

 made by Dr. Nieuwenhuis on his second voyage on the 

 Upper Mahakkam from November 20th 1898 to March 

 1st 1899. This collection arrived in the Leyden Museum 

 a week ago and was enregistered in the present paper after 

 this latter was made ready for the press. The collection 

 contains 658 specimens representing 141 species, ten of 

 which had not been represented in our previous collections. 



Dr. Nieuwenhuis having meanwhile undertaken a new 

 expedition in East-Borneo, this time more to the north, 

 we may hope that he will be able to continue his col- 

 lecting work in a territory which is zoologically still quite 

 unknown, and that his new collections will strongly 

 increase our knowledge of the ornis of the island, though 



Notes from the Leyden MLuseuin, "Vol. XiX-I. 



