Mirocastnia smalli is a moth in the Castniidae family. It is found in Panama.Osservazioni su alcuni taxa dei generi: Corybantes Hübner, 1819, Athis Hübner, 1819, Zegara Oiticica, 1955, Mirocastnia Miller, 1980 e Insigniocastnia Miller, 2007 (Lepidoptera: Castniidae) The habitat consists of a forest with Colpothrinax cookii palms, several moss covered trees and Bromeliaceae species.

The length of the forewings is 21.5–26 mm for males and 19.5–29 mm for females. Adults are on wing from March to August.Studies in the Castniidae - III Mirocastnia They mimic Pythonides limaea.

Etymology The species is named for Gordon B. Small, who first collected the species.

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