PREFACE 
TO THE PRESENT EDITION, 
A EE-issuE of tliis work being required^ it has been thought 
advisable not to alter either the names or numbers employed to 
distinguish the various species in the former edition, to which constant 
reference has been already made in works published since its first 
appearance, and of which the change or transposition would lead to 
much confusion. But inasmuch as during that period the nomen- 
clature and classification both of the diurnal and nocturnal species 
have undergone a very strict revision, especially by Messrs. H. 
Doubleday and J. F. Stephens, in order to arrive at a fixed and 
imiform system of names employed both by English and Conti- 
nental Entomologists, and as this revision has rendered necessary an 
alteration in the names of a great number of species, it has been 
considered that it would be more useful to add such revised names, 
when necessary, beneath the names employed in the former edition ; 
such names being, in fact, those which ought to be adopted ; and being 
in all such cases enclosed within brackets. Thus, PI. I. fig. 4. instead 
of representing the Papilio Chrysotheme, as stated in page 1, is that 
of a variety of Papiho Edusa. Wherever it has also been necessary 
to alter the modern generic names in the third column, the names 
substituted in lieu thereof are also enclosed witliin brackets. 
It is further purposed to add a certain number of Supplemental 
Plates, illustrating species discovered since the pubHcation of the 
former edition, together with a synoptic list of the whole of the 
species, in order to shew their distribution into families, and the 
position of the supplemental species, and of those whose generic 
classification has been modified. 
J. O. W. 
