vi PKEFACE. 



In addition to examples of the named forms and geographical races illustrating the 

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

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



The nomenclature employed in the collection has been largely followed in the 

 Catalogue, but in a few cases it has seemed desirable to place certain species in genera 

 different to those they were found placed in. 



A small number of species from various localities, chiefly Himalayan, were without 

 names, and these have been identified and duly entered in the Catalogue. 



