Phaenagrotis hecateia is a moth of the family Noctuidae. It is found in the Santiago, Valparaíso, Maule and Araucanía Regions of Chile.

Phaenagrotis hecateia
Scientific classification
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P. hecateia
Binomial name
Phaenagrotis hecateia
Köhler, 1953

The wingspan is 40–45 mm. Adults are on wing from February to May.

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