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These five recommendations will together result in establishing Plebejus Kluk, 1780 as the correct name for the genus. The important principles of priority and stability of the ICZN will both be met. We will also refer the following recommendation for an Opinion: 6. That the date of first publication of names Nymphalis Kluk, Heliconius Kluk, and Danaus Kluk (Lepidoptera: Nymphalidae) be determined to be 1780. The purpose of this last recommendation is to establish the date of publication of Nymphalis, Heliconius and Danaus as 1780 through the principle of priority, without affecting stability because there is no variation in spelling. Acknowledgements — We heartily express our thanks to Dr. Janusz Wojtusiak, professor of the Instytut Zoologii, Uniwersytet Jagiellonski (Krakow, Poland) for his generous help in finding and copying the relevant portions of the different editions of Kluk's book. Dr. Donald Lafontaine of the Canadian National Collection of Insects and Arthropods (Ottawa, Canada) generously provided copies of some of the literature. Dr. Philip Tubbs, of The Natural History Museum (London, England), examined the copy of Kluk (1802) at that institution to confirm the spelling in that book. Dr. Gerardo Lamas (Lima, Peru) commented an earlier draft of the present paper. REFERENCES Bálint, J., Kertész, A. & Lukhtanov, V. A. (1993): A survey of the subgenus Plebejides Sauter, 1968 (Lepidoptera, Lycaenidae). — Entomological Review 72(5): 23-149. Beattie, J. R. (1976): The Rhopalocera directory. — Berkeley, CA, JB Indexes, xiv, 365 pp. Beuret, H. (1961): Die Lycaeniden der Schweiz. III. Teil Plcbcjinac (Bläulinge): Plcbejidi. — Mitteilungen der entomologische Gesellschaft, Basel, 11: 272-420, pis 15-22. Bridges, CA. (1988): Catalogue of Lycaenidae & Riodinidae (Lepidoptera: Rhopalocera). — Urbana, IL, CA. Bridges, vii + ii + 377 + ii + 115 + ii + 140 + ii + 101 + ii + 37 + ii + 12 + ii + 1 + ü + 10 pp. Cowan, Ch. R (1970): Annotaiiones Rhopalocerologicae. — Berkhamsted, Author. 70 pp. Ebert, G. (ed.) (1991): Die Schmetterlinge Baden-Württembergs, Band 2: Tagfalter. — Stuttgart, Verlag Eugen Ulmer, 535 pp. Emmel. T. C. (ed.) (1998): Systematics of Western North American Butterflies. — Gainesville, FL, Mariposa Press, xxviii + 878 pp. Emmet, A. M. & Heath, J. (eds) (1990): 77ie moths and Butterflies of Great Britain and Ireland. Vol. 7, Pt. I, Hesperiidae to Nymphalidae. — Colchester, UK, Harley Books, ix + 370 pp. Guppy, C. S. & Shepard. J. H. (2001): The butterflies of British Columbia. — Vancouver, BC, UBC Press, 414 pp. Hemming, F. (1933): Additional notes on the types of certain butterfly genera. — Entomologist 66: 222-225. Hemming, F. (1954): On the status of the names of one hundred and two genera in the Order Lepidoptera (Class Insecta) proposed by Jacob Hübner in the "Tentamen", with special reference to the names proposed for thirteen genera of the Sub-Order Rhopalocera. in International Commission on Zoological Nomenclature. 1954. Opinion 278. Addition to the Official List of Generic Names in Zoology of the names of ten genera of the Sub-Order Rhopalocera of the