S. Mahunka szerk.: Folia Entomologica Hungarica 62. (Budapest, 2001)

RESULTS: SUGGESTIONS FOR THE SOLUTION A decision is required as to which of the four known variations of the generic name of this group of "blue" butterflies should be used. We found no evidence to determine which printing of Kluk (1780) was the first edition, and consider it unlikely that it will ever be possible to do so. The two printings must therefore be considered to have been published on the same date. Paclt (1955) was not the first reviser because he was unaware of the name Plebejus Kluk, 1780 (Article 24.2.3). We are therefore the first revisers (Article 24.2), and, as such, we fix Plebejus Kluk, 1780 for use rather than Plebeius Kluk, 1780. Following the principle of priority, which is a key principle of the ICZN, Plebejus Kluk, 1780 has priority over Plebejus Kluk, 1802. However, the name chosen for use should not "threaten stability or universality or cause confusion' (Article 23.9.3), because "the Principle of Priority is to be used to promote stability and it is not intended to be used to upset a long-accepted name in its accustomed meaning by the introduction of a name that is its senior synonym" (Article 23.2). A change in publication date, while retaining spelling and author, will not threaten stability or universality or cause confusion. Therefore, the principle of priority combined with the objective of stability is met by our fixation of Plebejus Kluk, 1780 as the generic name. It is important to note that Paclt (1955) has established that the author and date of Kluk, 1780 similarly applies to the genera Danaus, Nymphalis, and Heliconius, which have no variation of spelling in the Kluk publications. The spelling Plebeyus Kluk, 1802 is simply an incorrect subsequent spelling of Plebejus Kluk, 1780, because it is not in prevailing usage (Article 33.3.1). It is worth noting that Plebejus was the accepted Latin spelling of the word at the time of Kluk (1802), and is specifically listed with that spelling on page 1123 of the Latin-German part of Joh & Serieller (1806), the most widely distributed classical Latin-German dictionary in central Europe at that time. A generic name must have a type species designated to stabilize the usage of the genus. Hemming (1933) designated the type species of Plebejus Kluk, 1802 as Papilio argus Linnaeus, 1758, and that designation was finalized in ICZN Opinion 278. Plebejus Kluk, 1780 is the same taxon, therefore Hemming's (1933) designation of Papilio argus Linnaeus, 1758 as the type species of Plebejus Kluk, 1802 results in Papilio argus Linnaeus being the type species of Plebejus Kluk, 1780. We will refer the following recommendations for Opinions to the international Commission on Zoological Nomenclature: 1. That the name Plebejus Kluk, 1780 be placed on the Official List of Generic Names; 2. That the first publication date of the generic name Plebejus Kluk be accepted as 1780; 3. That the type species for Plebejus Kluk, 1780 be designated as Papilio argus Linnaeus, 1758; 4. That the name Plebejus Kluk, 1780 has priority over Plebeius Kluk, 1780; 5. That the name Plebeyus Kluk, 1802 is an incorrect subsequent spelling of Plebejus Kluk, 1780.