Drepanogynis bifasciata, the Sargasso Emerald, is a species of moth of the family Geometridae first described by Hermann Dewitz in 1881.

It is found in South Africa, Lesotho, and Zimbabwe.

Thorax green, abdomen brown; forewings green, marked with 2 wide, meandering white lines (edged with brown in some specimens) and white ring between, margins with white flashes, sometimes brown between these; hindwings white basally with central brown cell spot, wide light brown margin often chequered brown and white."

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