Bulletin of Zoological Nomenclature 46(3) September 1 989 205 OPINION 1556 Dytiscus ater De Geer, 1774 (currently Ilybius ater) and Dytiscus planus Fabricius, 1781 (currently Hydroporus planus; Insecta, Coleoptera): specific names conserved Ruling (1) Under the plenary powers the specific name ater Forster, 1771. as published in the binomen Dytiscus ater, and all uses of that name prior to the publication of Dytiscus ater De Geer, 1 774, are hereby suppressed for the purposes of both the Principle of Priority and the Principle of Homonymy. (2) The following names are hereby placed on the Official List of Specific Names in Zoology: (a) ater De Geer, 1 774, as published in the binomen Dytiscus ater, (b) planus Fabricius, 1 78 1 , as published in the binomen Dytiscus planus. (3) The name ater Forster, 1771, as published in the binomen Dytiscus ater and as suppressed in (1) above, is hereby placed on the Official Index of Rejected and Invalid Specific Names in Zoology. History of Case 2586 An application for the conservation of the specific names of Dytiscus ater De Geer, 1 774 and Dytiscus planus Fabricius, 1 78 1 was received from Dr A. N. Nilsson ( Univer-sity ofUmea, Sweden) on 19 December 1986. After correspondence the case was pub-lished in BZN 44: 1 78-1 79 (September 1 987). Notice of the case was sent to appropriate journals. No comments were received. Decision of the Commission On 1 March 1989 the members of the Commission were invited to vote on the proposals published in BZN 44: 179, with proposal (1) amended to suppress all uses of ater Forster, 1771 prior to the publication of De Geer's name. At the close of the voting period on 1 June 1989 the votes were as follows: Affirmative votes — 21: Bayer, Bock, Cocks, Cogger, CorHss, Dupuis, Hahn, Halvorsen, Holthuis, Kabata, Kraus, Lehtinen, Martins de Souza, Mroczkowski, Nielsen, Ride, Savage, Schuster, Thompson, Ueno, WiUink Negative votes — none. No vote was received from Heppell. Starobogatov and Trjapitzin were on leave of absence. ; Original references The following are the original references to the names placed on an Official List and an Official Index by the ruling given in the present Opinion: ater, Dytiscus, Forster, 1771, Novae species Insectorum I. p. 54. ater, Dytiscus, De Geer, 1 774, Memoires pour servir a I'histoire des insectes, vol. 4, p. 40 1 . planus, Dytiscus, Fabricius, 1781, Species Insectorum, vol. 2, p. 501.