The purpose of this application, under Article 75.5 of the Code, is to conserve the widely used name Chrysophanus florus Edwards, 1884 (currently Lycaena florus) for a butterfly species from North America by designating a neotype for Polyommatus castro Reakirt, 1866. The identity of Polyommatus castro (currently Lycaena castro) is uncertain because its lectotype is similar to the widespread lowland Lycaena helloides (Boisduval, 1852) in one trait and similar to the high-altitude Rocky Mountains butterfly Lycaena florus (Edwards, 1884) in another trait, and it lacks precise locality data that could have indicated its identity. A male of L. helloides is proposed as the neotype of L. castro, which will both fix the identity of L. castro as L. helloides, a synonymy accepted for 102 years, and conserve the name Chrysophanus florus Edwards, 1884 (currently Lycaena florus), which has been used for 125 years for the high-altitude butterfly and has been used in most of the scientific papers on the species.

The purpose of this application, under Article 70.2 of the Code, is to conserve usage of the genus Clusiodes Coquillett, 1904 (replacement name for Heteroneura Fallén, 1823) by designating H. albimana Meigen, 1830 as the type species. It has been long overlooked that the type species of Heteroneura is actually H. muscaria Fallén 1823, a species now assigned to Cnemacantha Macquart, 1835 in the family lauxaniidae Macquart, 1835. It is proposed that H. albimana be designated the type species of Heteroneura in order to maintain the current usage of the name Clusiodes for a widespread, regularly collected and frequently discussed taxon in the clusiidae Handlirsch, 1884.

The purpose of this petition, under Articles 23.9.3 and 81.2.3 of the Code, is to give the widely used halictine bee generic names Dialictus and Evylaeus, both proposed by Robertson in 1902, precedence over the rarely used but older names Hemihalictus Cockerell, 1897, Sudila Cameron, 1898 and Sphecodogastra Ashmead, 1899 whenever these names are considered to be synonyms. This proposal is intended to best conserve the standard usage of these names.

The purpose of this application, under Article 75.6 of the Code, is to set aside all type fixations for a species of extinct vole Villanyia exilis Kretzoi, 1956 prior to that by Terzea (1991) in order to conserve prevailing usage. The lectotype and paralectotype demonstrably belong to two different taxa. The specimen designated as lectotype by Rabeder (1981) is considered to belong to Dolomys kretzoii Kowalski, 1958 (currently Clethrionomys kretzoii). The paralectotype corresponds to the original species description and represents a taxon uniformly recognised in the current taxonomic and biostratigraphic literature as Villanyia exilis Kretzoi, 1956, which usage should be conserved.

The purpose of this application, under Article 75.5 of the Code, is to conserve the usage of the name Mastodon waringi Holland, 1920, for a species of extinct South American proboscidean, by designating a neotype. Because M. waringi has had long and wide (though incorrect) usage as a species of Haplomastodon, and because the holotype of M. waringi is undiagnostic, the neotype designation is proposed to promote stability of nomenclature.

The Commission has ruled that the generic name Trigonostomum Burmeister, 1844 for a scarabeid beetle be suppressed, and the incorrect subsequent spelling Trigonostomus Brenske, 1893 is deemed available. The Commission has also ruled the entire generic name Trigonostomus Brenske, 1893 should be adopted as the stem, so that the correct spelling of the chafer subtribe name will become trigonostomusina Ohaus, 1912 to remove homonymy with the flatworm family-group name trigonostomidae Graff, 1905. This conserves the widespread usage of the generic name Trigonostomum Schmidt, 1852 for a group of marine flatworms.

The Commission has confirmed the status of the family-group name araneidae (originally Aranei) with the authorship Clerck, 1758 for a family of spiders, designated Araneus angulatus Clerck, 1758 as the type species for the generic name Araneus Clerck, 1758, and conserved the generic name Tegenaria Latreille, 1804 by suppression of its senior objective synonym Aranea Linnaeus, 1758.

The generic name Reticulitermes Holmgren, 1913, for an economically important and universally known group of subterranean termites responsible for most economic damage in the Northern Hemisphere, was conserved by being given precedence over Maresa Giebel, 1856.

A proposal to conserve the generic name Germarostes Paulian, 1982 and the subgeneric name Haroldostes Paulian, 1982 for a group of New World scarab beetles by suppression of the senior subjective synonym Sphaerelytrus Blanchard, 1841 was not supported by the Commission.

The Commission has ruled that priority is maintained for the leaf beetle generic name Fidia Motschulsky, 1860, thus it remains the senior homonym of Fidia Baly, 1863 and senior objective synonym of Lypesthes Baly, 1863.

A proposal to conserve the generic name Dactylozodes Chevrolat, 1838 for a buprestid (jewel beetle) by suppression of its senior subjective synonym Lasionota Mannerheim, 1837 was not accepted.

Ruling (2)(a) in Opinion 2218 is to be read as follows: