Napeogenes sylphis is a species of butterfly of the family Nymphalidae. It is found in South America.
The larvae of subspecies N. s. acreana have been recorded feeding on Lycianthes species.
Subspecies N. s. sylphis (Bolivia and Peru) N. s. acreana d'Almeida, 1958 (Brazil) N. s. caucayensis Fox & Real, 1971 (Colombia) N. s. corena (Hewitson, 1861) (Ecuador, Colombia, Brazil and Peru) N. s. ercilla (Hewitson, 1858) (Brazil) N. s. ehu Brevignon, 2007 (French Guiana) N. s. ithra (Hewitson, 1855) (Brazil) N. s. potaronus Kaye, 1905 (Guyana) N. s. rindgei Fox & Real, 1971 (Peru) N. s. thira (Hewitson, 1874) (Bolivia and Peru)
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