The Promethea Silkmoth displays dramatic sexual dimorphism: females are rusty-brown and patterned, while males are almost entirely dark maroon-black with tan borders, mimicking the toxic Pipevine Swallowtail. Males fly late in the afternoon in a distinctive Pipevine Swallowtail-like manner. The silken cocoon is wrapped within a suspended leaf.
Best time to see a Promethea Silkmoth
The best time to see a Promethea Silkmoth is April–July, when about 67% of U.S. sightings happen, based on 6,702 research-grade iNaturalist observations.
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