vi PREFACE. 



In addition to examples o£ the named forms and geographical races illustrating the 

 variation of- most of the species, there are numerous aberrations : some of these are of a 

 character perhaps rarely seen in collections, whilst others are probably unique. 



The nomenclature employed in the collection has been hirgely fulluwed in the 

 Catalogue, but in a few cases it has seemed desirable to place certain s]iecie.s in genera 

 different to those they were found placed in. 



A small number of species from various localities, chiefl}' Hi-ualayan, wf-re without 

 uames. and these have been identified and dulv entered in the Catalooue. 



