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Czechoslovakian Stamp - Blue Underwing
Czechoslovakia. Blue Underwing Moth. Catocala is a generally Holarctic genus of owlet moths (family Noctuidae or superfamily Noctuoidea) commonly known as underwing moths or simply underwings. The genus name Catocala roughly means "beautiful hindwings". It is a combination of two Ancient Greek words, kato (κάτω, "the rear one" or "the lower one"), and kalos (καλός, "beautiful")