Black Witch (Ascalapha odorata) Spanish Name: Bruja Negra
About The Black Witch
Both dry and moist forest habitats are suitable for the black witch. It is a common insect in lowland rainforest in Costa Rica, particularly near rivers or ravines with shade.
This moth can survive as far north as southern Florida and as far south as Brazil and Peru, as low as sea level and as high as 3,048 m in elevation. At night it can be found hovering near lights both in towns on the coast and high up in the Andes Mountains.
Santa Rosa National Park, Guanacaste National Park, Barra Honda National Park, and Rincón de la Vieja National Park.
This very large moth is patterned in different shades of brown and has one darker comma shape on each forewing. Females have an additional pink-purple marking across each wing.
Biology and Natural History
With the moniker from Mexican folklore, “Mariposa de la Muerte,” meaning “butterfly of death,” the black witch moth should perhaps be a little more frightening. Because it is mostly active at dawn and dusk, in these half-lit times the large moth’s flittering flight pattern resembles that of a bat. If disturbed while resting during the day, the moth will rush out of its hiding place, which also resembles a bat’s behavior. It should be noted that neither moths nor bats are dangerous.
This moth is drawn each night to bananas and fruits that grow high in the forest canopy. During daylight hours, black witches seek out darker corners of the forest such as tree hollows or rock crannies.
A capable distance flier, the black witch moth travels all over the continent throughout the year in unpredictable movements. The moth breeds in Mexico and even farther south, but from August to October it may be found in California, New York, Minnesota, Kansas, and even southern Canada.
As an adult, this moth sucks the juices of rotting fruit. As a caterpillar, it consumes the leaves of host plants mostly from the bean family (Fabaceae).
An adult’s wingspan is about 15 cm; females can grow a little larger than males.
Henderson, Carrol L. Field Guide to the Wildlife of Costa Rica. University of Texas Press, Austin, 2002.
Hogue, Charles L. Latin American Insects and Entomology. University of California Press: Berkely and Los Angeles, 1993.
Hogue, C. L. and Janzen, D. H. in Janzen, Daniel H. Costa Rican Natural History. Chicago: University of Chicago Press, 1983.
Kricher, John. A Neotropical Companion: an introduction to the animals, plants, and ecosystems of the New World tropics. Princeton, NJ: Princeton University Press, 1997.
-Amy Strieter, Wildlife Writer