150 BIRDS OF THE 
we may not expect many forms not stated already from 
Central-Borneo. 
For conveniances sake I have adopted in the present 
list, with but a few exceptions, the systematical arrange- 
ment used by Count Salvadori in his »Catalogo sistematico 
degli Uccelli di Borneo”, published in »Annali del Museo 
Civico di Storia Naturale di Genova, 1874”, which excel- 
lent work, treating of 392 species, may still be considered 
the most important publication on this subject). 
Another review of the birds of Borneo, enumerating 472 
species, has been published by Dr. Vorderman under the 
title: » Liste des Oiseaux de Borneo” in Natuurkundig Tijd- 
schrift van Nederlandsch Indié, Vol. XLVI, afl. 3 (1887). 
A very important review of the birds of Borneo, worked 
up to date, is A. H. Hverett’s »List of the Birds of the 
Bornean Group of Islands” in the Journal of the Straits 
Branch Royal Asiatic Society, 1889, pp. 91—212, with 
map 2). This list treats of not less than 570 species, a 
good number of which however are restricted to the island 
of Palawan, an island which cannot readily be understood 
as belonging to the »Bornean group of Islands”. Since 
the issue of this useful publication, very successful explo- 
rations have been made by Mr. Charles Hose and also by 
Mr. Everett in the Baram valley and the mountainous 
interior of Sarawak. Especially in this latter region the 
work of these indefatigable explorers was crowned with 
enormous success, especially with regard to the great num- 
ber of new species discovered in the dense and inaccessable 
mountain-forests (Mount Penrisen, Mount Kalulong, Mount 
Mulu, Mount Dulit and other mountains with an eleva- 
tion of more than 1000 meter above the level of the sea). 
As I already pointed to in my above-mentioned intro- 
duction, I was able to state some of those special moun- 
1) This work is quoted in the following list under the abbreviated form of 
#Salvad. Uce. Born.” 
2) Quoted hereafter as ,Everett, L. B. Born.” 
Notes from the Leyden Museum, Vol. X XI. 
