Two new sister species of Gastroplakaeis: G. lidia and G. alena (Lepidoptera, Lasiocampidae, Lasiocampinae, Selenepherini)

Two new peculiar Gastroplakaeis Möschler, 1887 are described: Gastroplakaeis lidia sp. n. from Ivory Coast and Gastroplakaeis alena sp. n. from the Democratic Republic of the Congo. Both are similar in appearance but separated by the Dahomey Gap. Adults of both sexes and their genitalia are figured.