46 Bulletin of Zoological Nomenclature 57( I ) March 2000 for a long time. It was mentioned by Zimmer (1940, pp. 1-2) and Day (1980, pp. 221, 264), while Bacescu (1992, pp. 274, 277) extensively discussed the matter and explained two possible solutions: (1) the fixation of a neotype for Diastylis arenarius, the type species of the genus, or (2) the fixation of a different type species. Day and Bacescu agreed that if the second course were followed the most suitable type species would be Cumu rathkii Kroyer, 1841, and we must be grateful to Dr Gerken for proposing that the Commission should designate this species. I wholeheartedly agree with her action, though I have a few remarks on minor points of detail. In para. 1 Dr Gerken says that Diastylis arenarius was the only species included in the genus and is therefore the type species by monotypy. However, after describing D. arenarius Say (1818, p. 315) noted 'I think there is little doubt of this animal being congeneric with Cancer seorpioides, described by Montagu' and on p. 316 he continued 'Cancer esca Gmel. ... will ... form a third species of this genus'. As mentioned in para. 3 of the application, Montagu's species is now placed in Bodotria and Gammarus esca Fabricius, 1779 is unidentifiable. The first fixation of a type species known to me was by Fowler ( 1912, p. 534) who cited D. arenarius in the behef that the genus was originally monotypic. The 'type locality' mentioned in Dr Gerken's para. 5 actually consists of two widely separated localities: Hornbaek (Denmark) in the Kattegat and southern Greenland. As the type material in Copenhagen consists of several specimens from these two localities it would be advisable to select a lectotype for Cuma rathkii in case the existing syntypes are found to represent more than one taxon. Additional reference Fowler, H.W. 1912. The Crustacea of New Jersey. Report of the State Museum of New Jersey, 1911: 29-650, pis. 1-150. Comment on the proposed precedence of nymphixinae Duponchel, |1845| over ACENTROPINAE Stephens, 1835 (Insecta, Lepidoptera) (Case 3048; see BZN 56: 31-33) Wolfgang Speidel and Wolfram Mey Museum fiir Naturkunde, Institut ftir Systematische Zoologie, Humboldt-Universitdt, Invalidenstr. 43. D-10115 Berlin. Germany In the past the crambid species concerned in this case were generally referred to as the NYMPHULiNAE. The single species Acentria ephemerella [Denis & Schiffermiiller], 1775 was placed in a separate subfamily on its own; Acentria ephemerella is a senior subjective synonym of both Phryganea nivea Olivier, 1791, the type species of Acentria Stephens, 1 829, and oi Acentropus garnonsii Curtis, 1 834. the type species by original designation of Acentropus Curtis, 1834. The latter nominal genus is the basis of the subfamily acentropinae Stephens, 1835; under the provisions of the Code (Article 40.1 of the 1999 Edition) acentropinae is a potentially valid name even though Acentropus is invalid because it is a junior synonym of Acentria. Acentria ephemerella was placed by one of us (Speidel, 1981) in the same subfamily as the species which were classified in the nymphulinae; this resulted in the synonymisation of acentropinae Stephens, 1835 and nymphulinae Duponchel,
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