SCHEME OP WORK. 15 



species figured. Descriptions of all species hitherto described are 

 included of which specimens are available for study, or about which 

 sufficiently reliable information is published to enable them to be 

 classified with approximate correctness, and lists of the species of 

 which the descriptions are insufficient will be given at the end of 

 the families ; no new species are described unless they are repre- 

 sented by specimens in the British Museum. 



Local races are treated as subspecies with their own references 

 and synonymy, but the references to what are considered to be 

 varietal forms are given in the general synonymy. 



Species that are not in the British Museum are marked by an (*) 

 so as to enable students to know what material will be available for 

 study, and also as a help to filling up the gaps in the Collection. 



The locality from which all the types in the Collection came will 

 be clearly stated, also the collections in which all types are at 

 present deposited (when definitely known), those examined for 

 purposes of the work being marked with a (t). 



The range of the species is gone into with some minuteness, all 

 the countries and their main divisions in which the species occurs 

 being given in small capitals, and the towns or smaller districts in 

 ordinary type, the name of the collector also (when known) being 

 added as a guide to the reliability of the habitat ; doubtful habitats 

 are marked with a (?). 



