146 BIRDS OF THE 



from November 1898 to March 1899, made collections of 

 birds on the Upper Kapoeas ') and on the River Mahakkam 

 (East-Borneo) and its tributaries. 



Moreover I am indebted to Mr. L. Westeneuk, an oflBcer 

 in the Dutch colonial civil service, at that time » Assistent 

 Resident" at Sanggau, for a small collection of birds 

 preserved in spirits, from the junction of the Sekajam 

 with the Kapoeas River and sent to me after my return 

 to Leyden. 



In my above-mentioned introduction ^) I have plainly 

 sketched the oro- and hydrographical conditions of the 

 country as well as its climate and vegetation, factors which 

 are of great influence upon the oro is of the explored ter- 

 ritory, so that I hardly need to add any more particulars to it. 



At the same place I called attention to the lack of 

 water-birds in my collection, due to my neglecting to spend 

 some time in the coast-region, and the small collection 

 made by Mr. Moret at Pontianak has not added an impor- 

 tant number of species of water-birds. 



The bird-collections made by Dr. Nieuwenhuis, also 

 enumerated in the present paper 3), contain among the 815 



1) The letters *oe" in Dutch geographical names ought to be pronounced 

 as »uli". 



2) Since the publication of this introduction, in which I enumerated (p. 1) 

 the publications on various parts of the zoological collections of our expedi- 

 tion, the following papers on this subject have been published in the Notes 

 from the Leyden Museum: 



M. M. Schepman, description of a new Ü7iio from Borneo. Vol. XX, p. 



92 (pi. 1). 

 Dr. O. Finsch, on the specific distinction of the Ground-Cuckoos of Borneo 



and Sumatra. Vol. XX, pp. 93—96. 

 Dr. F. A. J ent ink, the Mammals, collected by Dr. Nieuwenhuis on his 



second expedition to Borneo. Vol. XX, pp. 113 — 125 (pi. 2). 

 Dr. J. G. de Man, Crustaceans of the Dutch Borneo-Expedition, part I. 



Macroura. Vol. XX, pp. 137—161 (plates 6, 7 and 8); — id., part II. 



Brachyura. Vol. XXI, pp. 53 — 144 (plates 5—12). 

 Dr. R. Horst, on the variability of characters in Pericbaetidae. Vol. XX, 



p. 206. 



3) These important collections, as well as mine, have kindly been presented 

 to the Leyden Museum by the /-Maatschappij ter bevordering van het natuur- 

 kundig onderzoek der Nederlandsche Koloniën." 



Notes from the Leyden IMuseum, Vol. XXI. 



I 



