Lieinix nemesis, the frosted mimic-white, nemesis mimic white or falcate dismorphia, is a butterfly in the family Pieridae. It is found from Mexico to Peru. The habitat consists of mid-elevation cloudforests.
The wingspan is .Parque Nacional Sangay (Ecuador) Adults are sexually dimorphic.
The larvae probably feed on Inga species, including Inga mortoniana and Inga densiflora.
Subspecies The following subspecies are recognised: Lieinix nemesis nemesis (Ecuador) Lieinix nemesis nayaritensis Llorente, 1984 (Mexico) Lieinix nemesis atthis (Doubleday, 1842) (Mexico, El Salvador)
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