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H. hecale occurs from sea level to 1,400 m in tall forests. Usually individuals fly rapidly in the canopy and erratically in the lowerstory. Females mate multiply and adults roost solitarily or in loose groups at night at 2-10 m above ground on twigs or tendrils.
Hostplant: H. hecale larvae feed primarily on plants from the subgenera Granadilla and Distephana (Passifloraceae), as a secondary source H. hecale use Astrophea and in laboratory conditions they accept Dysosmia (Passifloraceae) (Brown, 1981). In Panama H. hecale most commonly feeds on Passiflora vitifolia (C. Jiggins, pers obs.)