The value of a work of this kind, as a convenient index to the 

 genera and species of the group which forms its subject-matter, 

 is increased by anything which adds to the facility with which, 

 it can be consulted. It has accordingly been thought advisable 

 to issue a general index to the whole series ; and an additional 

 motive for doing so is indicated in the Editor's Preface. 



The several volumes of the ' Hand-list ' appeared in the years 

 indicated below : — 



The sequence of the orders and families and the number of 

 genera and species included are given in detail in Dr. Sbarpe's 

 Introduction published in Vol. V. 



A work which appears under these conditions can never be 

 complete ; since new genera and species continue to be described 

 during its progress. Advantage has, however, been taken of the 

 present opportunity to correct certain inaccuracies and omissions 

 in the indexes of the volumes as issued. This task, which has 

 proved far more laborious than would appear on the surface, 

 has been supervised by Mr. W. E. Ogilvie-Graut. 



SIDNEY E. HAEMER, 



British Museum (Natural History), Keeper of Zoology. 



London, March 1912. 



