IV PBBFACE. 



who has made this computation at my request, considers that the 

 number may even be higher than 1500, as many of the species in Gray's 

 ' Hand-list ' have not been recognized. 



I trust that the Index issued with the present volume will be 

 found of service, as not only the author himself, but also some other 

 ornithologists, have represented to me that such an Index would greatly 

 increase the utility of the work. 



E. EAY LAJSfKBSTEE, 

 Director, 

 Natural History Departments, 

 June 11, 1900. British Museum. 



