We analysed the eight volumes of Mémoires pour servir à l'histoire des insectes, published between 1752 and 1778 by De Geer, and an additional volume published by Retzius in 1783. We found that none of these works was consistently binominal. A great number of names of taxa of many insect and other arthropod groups that were established in those works are currently widely accepted and used, and regarding them as unavailable would cause an unnecessary amount of confusion and taxonomical instability. De Geer (1752) is a pre-Linnaean publication and the two parts of volume 2 (1771a, b) did not contain any Latin names. We propose that the works published by De Geer (1773, 1774, 1775, 1776, 1778) and Retzius (1783) be ruled to be available as binominal works and 140 polynominal names mentioned therein be suppressed, mostly for being identified as polynominal. Among the polynominal names included in these volumes were the very commonly used names for human lice (Pediculus humanus capitis and P. humanus corporis) which De Geer regarded as different species, not as subspecies of P. humanus. We suggest that P. h. capitis be considered available and that P. h. corporis be suppressed (the latter being commonly regarded as a synonym of P. h. humanus Linnæus, 1758 in modern biology and medicine). Generic names established as compound words connected with a hyphen should generally be regarded as binominal and available, but we propose to suppress De Geer's spider names Aranealupus, Araneaphalangium and Araneacancroides for the purposes of the Principle of Priority, but not for those of the Principle of Homonymy.

The purpose of this application, under Articles 78.1 and 81.1 of the Code, is to designate Actinia pedunculata Pennant, 1777 as the type species of the genus Cereus Ilmoni, 1830. Cereus pedunculatus is a widely-studied member of the order Actiniaria (sea anemones sensu stricto). The type species of Cereus by monotypy is currently Cereus cupreus, a nomen dubium not used since 1857 except in synonymy lists, and a member of the order Ceriantharia (tube anemones). We also request that the name Actinocereus Blainville, 1830 be suppressed for the purposes of the Principle of Priority.

The purpose of this application, under Articles 23.9.3 and 81 of the Code, is to conserve the name Phyllotreta undulata (Kutschera, 1860), for a common and widespread flea-beetle species (chrysomelidae, galerucinae), which is also a crop pest, by giving it precedence over the unused older name P. bivittata (Waterhouse, 1838), whenever these names are considered to be synonyms.

The purpose of this application, under Articles 75.5 and 75.6 of the Code, is to conserve the current usage of the name Aphodius fimetarius (Linnaeus, 1758) for a Holarctic species of aphodiine dung beetle. Since a different species has been erroneously designated as the lectotype, it is proposed that the previous type fixations for the species Aphodius fimetarius (Linnaeus, 1758) be set aside and a neotype consistent with the current usage be designated. Given that the species diagnostic morphological characters show variation overlapping with those of the most similar species, Aphodius pedellus (De Geer, 1774), we suggest a modern, chromosomally determined specimen as the neotype.

The purpose of this application, under Article 23.9.3 of the Code, is to conserve the widely used generic name Oscinella Becker, 1909 (chloropidae). The name Oscinella is threatened by its senior subjective synonyms Melanochaeta Bezzi, 1906 and Pachychaetina Hendel, 1907. Strict application of the Code would result in the name Oscinella frit (Linnaeus, 1758), uniformly used for ‘frit fly’, one of the most serious pests of cereals in the Palaearctic, having to change its generic epithet. It is proposed that Oscinella be given precedence over Melanochaeta and its objective synonym Pachychaetina over Oscinella Becker, 1909 whenever these names are considered to be synonyms.

The purpose of this application, under Article 75.5 of the Code, is to conserve the usage of the name Anchisaurus Marsh, 1885 (Lower Jurassic, Connecticut Valley, northeastern U.S.A.) that is based on Megadactylus polyzelus Hitchcock, 1865. It is proposed to replace the fragmentary and non-diagnostic holotype of M. polyzelus with a diagnostic neotype, an almost complete skull and skeleton (YPM 1883, holotype of A. colurus Marsh, 1891). This specimen has formed the basis for the concept of Anchisaurus, the first basal sauropodomorph genus from the U.S.A. and still the best represented from there since it was illustrated by Marsh (1892, 1893), and of A. polyzelus since it was illustrated by Galton (1976). Anchisaurus is the basis for anchisauridae Marsh, 1885, the first basal sauropodomorph family to be named, and for the Anchisauria Galton & Upchurch, 2004.

The purpose of this application, under Articles 78.1 and 80.2.2 of the Code, is to conserve current usage of the family-group name psittaculinae Vigors, 1825 as valid for the Indo-Australasian long-tailed parrots. This would be effected by designation of the generic name Psittacula Cuvier, 1800 as its type genus. Suppression of the junior homonym Psittacula Kuhl, 1820, upon which psittaculinae Vigors was originally based, will maintain stability in nomenclature. Suppression of the simultaneously published family-group name palaeornithinae Vigors, 1825, which was originally applied to the Indo-Australasian long-tailed parrots, is desirable as well.

The Commission has conserved the specific name Lamprocoris lateralis (Guérin-Méneville, 1838) for a species of jewel bug from Java by suppressing its objective senior synonym Lamprocoris obtusus (Westwood, 1837).

The Commission has conserved the specific name Callophrys dumetorum by designation of a neotype and the widely used name C. sheridanii has been given precedence over C. viridis whenever the two are considered synonyms. This is intended to eliminate nomenclatural confusion within the butterfly genus Callophrys Billber, 1820 resulting from differing identifications of the lectotype of Callophrys dumetorum which have changed the usages of C. dumetorum, C. viridis Edwards, 1862 and C. perplexa Barnes & Benjamin, 1923.

The Commission has conserved the specific name Megaselia abdita Schmitz, 1959 for a widespread Holarctic scuttle fly by suppressing its senior subjective synonym Megaselia griseipennis (Santos Abreu, 1921).

The Commission has conserved the names Psittacus tenuirostris Kuhl, 1820 and Licmetis pastinator Gould, 1841 (currently Cacatua tenuirostris and Cacatua pastinator; Aves, Psittaciformes) by designation of a neotype.

The Commission has conserved the generic name Paradisaea Linnaeus, 1758 and the family-group name paradisaeidae Swainson, 1825 for the birds of paradise by suppression of the competing spellings Paradisea Linnaeus, 1758 and paradiseidae Swainson, 1825. The spellings Paradisaea and paradisaeidae have been in prevailing use for over 90 years.

The Commission has conserved the generic name Rhynchotherium Falconer, 1868, applied to proboscidean fossils from North America, by designating Rhynchotherium falconeri Osborn, 1923 as the type species.

In a recent comment by Morris and Barclay (BZN 68: 292) a third author was erroneously included. His contribution was in fact a separate comment on the same subject, which is given on p. 293 of BZN 68. His inclusion on the earlier comment was the result of a printer's error. The correct citation of the comment is: ‘Morris, M.G. and Barclay, M.V.L. Comment on the proposed precedence of Maculinea van Eecke, 1915 over Phengaris Doherty, 1891 (Lepidoptera, ???lycaenidae) (Case 3508) 1. BZN 68: 292–293’.