Calephelis nemesis (fatal metalmark or dusky metalmark) is a butterfly in the family Riodinidae. It is found in the southern part of the United States and Mexico.Butterflies and Moths of North America Its habitats include chaparral canyons near rivers in arid areas, roads, and washes.
The wingspan is 20–25 mm.
The larvae feed on Encelia californica, Baccharis glutinosa, Clematis drummondii and Clematis henryi.
Subspecies Calephelis nemesis nemesis (northern Mexico, Arizona) Calephelis nemesis australis (W.H. Edwards, 1877) (Texas) Calephelis nemesis californica McAlpine, 1971 (California) Calephelis nemesis dammersi McAlpine, 1971 (California)
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