IV 
The generic synonymy has been revised throughout on the follow- 
ing principles, for a further exposition of which the reader is referred 
to an article in the “Journal of the Linnean Society, Zoology”, vol. X. 
pp. 494—530. 
I. The name of every homogeneous genus, if not a synonym, or 
previously used in Zoology or Botany, should be retained for 
some part of it. 
Il. In subdividing a genus, the original name should be restricted 
to the typical section, if this can be ascertained. 
Ii. Should the typical section not be ascertainable, the original 
name may be restricted to any section of the genus, unless it 
should be proposed to apply the name to a section which does 
not include a single species placed in it by fhe author who 
first proposed it. The same rule holds good if a generic name 
is retained which has hitherto been only used in a plate, or 
in a printed catalogue, without having been then defined. 
IV. The name of every genus which has been previously employed 
in either Zoology or Botany, should changed. 
V. No specific name should be elevated into the name of its genus- 
Some difference of opinion exists as to whether our specific no- 
menclature should commence with the 10 (1758) or 12 (1767) 
edition of Linnzeus’ “Systema Nature”. In the present work the latter 
date has been adopted as the starting-point. 
The author has much pleasure in acknowledging the important 
‘assistance which he has received from Messrs. Hewitson, Butler, and the 
late Dr. R. Felder, with whom he has been in constant correspondence, 
and also from Messrs. Atkinson, Bates, Deyrolle, Edwards, Herrich- 
Schiffer, Scudder, Wallengren, Watson, the late Herr Lederer, and 
others. The determination of the species of Papilio simultancously 
described by Felder and Wallace and most of the notes on Kuplaca in 
the Appendix, have been contributed by Mr. Wallace. 
Last but not least, the author gratefully acknowledges the in- 
valuable assistance which he has received from his wife in the laborious 
task of preparing the manuscript for the press. 
Royal Dublin Society, 
March, 1871. 
W. F. Kirby. 
