Abstract
Erythraeus (Parerythraeus) thomasi sp. nov. is described and illustrated based on specimens collected from Finland. Parerythraeus Southcott, 1946 stat. nov., previously synonymized with Erythraeus Latreille, 1806, is considered a subgenus of Erythraeus. Thirteen species, including E. (P.) thomasi, are included in this subgenus, and a differential diagnosis is provided for the 12 adequately described species. A key to all known species of Erythraeus (Parerythraeus) is also provided.
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