GENERIC NAMES OF BUTTERFLIES 7 



II. APPLICATION OF THE REVISED INTERNATIONAL CODE OF 

 ZOOLOGICAL NOMENCLATURE PUBLISHED IN 1961 



(a) Incorporation in the present work of such modifications of previous conclusions as 



have been rendered necessary by the new Code 



The revised text of the International Code of Zoological Nomenclature adopted 

 by the XVth International Congress of Zoology in London in 1958 and published in 

 1961 marks an immense improvement in the international regulation of zoological 

 nomenclature. This improvement is attributable not only to the insertion of 

 provisions relating to subjects not dealt with at all in the text previously in force 

 (namely that adopted by the IVth International Congress at Berlin 1901), but also 

 — and perhaps even more — to the clarification of numerous minor points in existing 

 provisions, doubts as to the interpretation of which had long been a cause of difficulty. 



Nevertheless, as is inevitable, the introduction of any new set of rules involves 

 certain difficulties in the transitional period immediately following the date on which 

 those rules first come into force. In the case of the present work a great deal of the 

 material on which it is based was compiled before the promulgation of the revised 

 text of the Code. Accordingly, on the publication of that volume it became neces- 

 sary to re-examine the whole of the material so far collected, in order, where necessary 

 to bring the conclusions previously reached into harmony with the revised provisions 

 of the Code. Fortunately, the majority of those provisions had already been adopted 

 either by the Paris Congress of 1948 or by the Copenhagen Congress of 1953. In 

 consequence, it was only in a small number of cases that it was necessary to modify in 

 the light of the new Code the conclusions previously reached in respect of the names 

 dealt with in the present work. It was necessary however to delete references to 

 Article Numbers in the old Code, wherever they occurred, replacing them with 

 references to the corresponding Articles in the revised text. 



(b) Revision of provisions relating to the determination of the precedence to be accorded to 



generic names published on the same date 

 One of the most useful of the provisions in the new Code clarifying obscure and 

 unsatisfactory provisions in its predecessor is Article 24(a) which relates to the 

 precedence to be accorded to names published on the same date. In the course of the 

 preparation of the present work numerous instances were found in which a nominal 

 species which was the type-species of some genus bearing an available name was 

 currently placed in some other genus published on the same date, without measures 

 having been taken to ensure that the generic name so adopted should in all circum- 

 stances take precedence over the name of the genus of which the species in question is 

 the type-species. In every such case a First Reviser choice under Article 24(a) has 

 now been made in my work Annotationes Lepidopterologicae, precedence being accord- 

 ed by these choices to the generic name currently in use over the other name or names 

 concerned. 



(c) Clarification of the provisions relating to the selection of lectotypes for nominal 



species 

 Another provision in the revised Code which replaces a badly worded provision in 



