Syllepte dioptalis is a moth in the family Crambidae. It is found in Honduras and Brazil (Ega, Amazonas).
Adults are bright metallic blue, the wings black with azure and purple reflections. The forewings have two white, nearly hyaline broad streaks in the disc. The hindwings have a broad white, nearly hyaline, stripe in the disc.List of the Specimens of Lepidopterous Insects in the Collection of the British Museum 34: 1376
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