INTRODUCTION. 
V. ACKNOWLEDGEMENTS. 
I cannot conclude this introduction without acknowledging the 
great help I have received, over a period of years, from numerous 
ornithologists. First, and foremost, is Mr. Norman Kinnear of the 
British Museum of Natural History, whose patience seems 
inexhaustible. Over a long period he has answered* promptly, many 
requests for the checking of references and type localities. 
In Europe my best thanks are also due to Lord Rothschild who 
allowed me to work at Tring; Dr. Erwin Stresemann of Berlin, 
who is always ready to examine critically a palaearctic migrant for 
me; and Mr, G. C. H. Junge who has answered numerous queries about 
specimens in the Leyden Museum, In the East, Mr. E. Banks, the 
Curator of the Sarawak Museum, has always placed his collections 
at my disposal in a most generous manner and by doing so has added 
materially to our knowledge of the Bornean fauna. Time and time 
again, without reserve, he has sent to me the results of his numerous 
collecting expeditions in Borneo. Dr. K. W. Dammermax of the 
Zoological Museum at Buitenzorg, Java, has also kindly placed 
valuable collections at my disposal. Messrs, E. Mayr, C. B. 
Ticehurst and J. H. Riley are other valued correspondents. 
Lastly, I am pleased to acknowledge the heavy debt I owe to 
my former chief, Mr. C. Boden Kloss. We originally planned to 
produce this list in collaboration, and in its early days used to discuss 
difficulties as they arose. 
Singapore, December, 1935. 
F. N. CHASEN. 
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