Lygropia cosmia is a moth in the family Crambidae. It is found in Panama.
The wingspan is about 15 mm. The wings are bronzy brown-black, the forewings with a costal yellow half-bar on the outer fourth. There is a double spot in the cell, conjoined below and touching an oblique broad half-band near the base of the inner margin. The hindwings are yellow at the base.Proc. U.S. nat. Mus. 47 (2050): 275
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