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Ascalapha odorata is a large bat-shaped, dark-colored nocturnal moth. Males can attain a wingspan of 16 cm. The dorsal surfaces of their wings are mottled brown with hints of iridescent purple and pink, and, in females, crossed by a white bar. [Males lack this bar.] The diagnostic marking is a small spot on each forewing shaped like a number nine or a comma. This spot is often green with orange highlights. Females are somewhat smaller, reaching 12 cm in width, and lighter in color. The larva is a large caterpillar up to 7 cm in length with intricate patterns of black and greenish brown spots and stripes.
Tropical and subtropical forests.