PREFACE. 
Index Zoologicus, No. 1 for tlie period of 1800-1900, was 
published by the Zoological Society of London in 1902. The 
Council of the Society has since then decided that a decennium is 
a convenient and sufficient interval for a work of this kind, and we 
have now the satisfaction of offering to the Public Index No. 2 for 
the years 1901-1910. 
This volume is as nearly as may be similar to its predecessor, 
but a complication has been introduced by the indexing of the 
International Catalogue of Scientific Literature, Zoology. The way 
in which this is done is explained on the first page of the body 
of this Index. A certain number of names contained in the 
International Catalogue had already appeared in earlier volumes of 
the e Zoological Record,’ and are consequently included in our 
Index No. 1. These names are placed in square brackets here. 
Although the primary object of the work is to serve as an 
Index to the ten years mentioned, yet it is also planned so as to be 
with Scudder’s well-known 4 Nomenclator ’ a complete register of 
the names of Genera and Subgenera proposed for use in Zoology. 
We have therefore included the names that are contained in some 
lists that have been published since the appearance of Index No. 1. 
The following are the published lists that have been used : — 
(1) F. Poche. — Supplement zu C. O. Waterhouse’s 1 Index Zoologicus.’ Zool. 
Ann., Wurzburg, 2, 1908, pp. 273-343. 
(2) E. Bergroth. — Additions and Corrections to the ‘Index Zoologicus’ of 
C. O. Waterhouse. Zoologist, 190o, pp. 03-67. 
