176 Bulletin of Zoological Nomenclature 44(3) September 1987 Case 2602 Dytiscus cinereus Linnaeus, 1758 (currently Graphoderus cinereus; Insecta, Coleoptera): proposed replacement of neotype A. N. Nilsson Department of Animal Ecology, University ofUmed, S-901 87, Umed, Sweden G. N. Foster 20 Angus Avenue, Prestwick, Ayrshire KA9 2 HZ, Scotland Abstract. The purpose of this appUcation is to designate a suitable neotype for Dytiscus cinereus Linnaeus, 1758, a common water diving beetle. The previous specimen designated as neotype is actually a specimen of Graphoderus bilineatus (DeGeer, 1774). 1. Balfour-Browne (1960, p. 246) argued in favour of the use of the Commission's plenary powers to designate a neotype for Dytiscus cinereus Linnaeus, 1758, not taken from the mixture of specimens standing under that name in Linnaeus' collection. 2. The Commission (Opinion 618; BZN 18: 365-368) accepted the argument in favour of selection of such a neotype. This proposal is not in dispute. 3. Prior to the ruling it was suggested (BZN 18: 366) that the specimen originally intended for designation as a neotype was unsuitable because its locality could not be defined except by inference. Consequently an alternative specimen was deposited in the collection of the British Museum (Natural History), labelled 'Catfield 9.Vin. 1905' and collected by F. Balfour-Browne. Its photograph was published by the Commission (BZN 18: pi. 5, opposite p. 367) and it was formally designated as neotype. 4. Angus (1976, p. 2) discovered that three species had been previously confused in the British list under the name cinereus. These were bilineatus De Geer, zonatus Hoppe and the true cinereus Linnaeus. The neotype of 'cinereus' was identified as a specimen of Graphoderus bilineatus (De Geer, 1774, p. 400) (E. J. van Nieukerken, /^er^. comm.). 5. If the neotype is retained and the Code is strictly applied Dytiscus bilineatus De Geer becomes a junior objective synonym of Z). cinereus Linnaeus, leaving the species currently known as cinereus without a name. 6. A specimen of the species currently known as Graphoderus cinereus (Linnaeus, 1 758) has been deposited in Lund Museum, Sweden. Its identity as that species has been confirmed by R. B. Angus, G. N. Foster and A. N. Nilsson and it bears their identifica-tion labels plus the locality data 'S: NA, Kvismaren 1 1/6 1982 Leg. Fagelstn' [Sweden, Province Narke, Lake Kvismaren] and red labels 'Neotypus'and'Neotype S Dytiscus cinereus Linnaeus, 1758 des. A. Nilsson 1986'. 7. The International Commission on Zoological Nomenclature is accordingly asked: (1) to use its plenary powers: (a) to set aside the previous designation of a neotype for Dytiscus cinereus Linnaeus, 1758; i
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