The Palaearctic species of the Pegomya terminalis species group (Diptera: Anthomyiidae), with descriptions of two new species

The Pegomya terminalis species group is redefined on the basis of the characteristic, exceptionally long and apically strongly depressed female oviscapt. A North American species has once been reared from horsetail (Equisetum sp.), and it is believed that all the species in this group as larvae feed on this unusual diet. The present paper reviews the known Palaearctic species with an identification key to males and females, illustrated descriptions and new records. The number of known species is raised from two to four with descriptions of two new species: P. glabroides sp. nov. from Norway, Sweden, Finland and France and P. skulei sp. nov. from Greece. A fifth undescribed species from Turkey is keyed and discussed. The P. terminalis species group is known with certainty only from the western part of the Palaearctic Region, where most species are confined to the southern, Mediterranean parts. Elsewhere, the species group is represented by 5-6 endemic species in North America and one unnamed species in South Africa.