
Appearance
The hind wings usually possess extensions, especially on males. There is also a presence of a hair tuft on both sides of the first abdominal segment, at the spiracular line. The antennae, wing venation, and genitalia vary in this group. The gnathos of the genital of a few species of Caio are present as short lateral arms connected by a plate.Their coloration is usually restricted to brown, gray, cream, and dull orange tones. The adults are usually very large. The wingspan of Caio romulus is approximately 12cm.
Distribution
Arsenurinae are exclusively neotropical moths.Food
A few species of Caio are known to feed on Bombacaceae, but Arsenurines are also known to be polyphagous.References:
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https://en.wikipedia.org/wiki/Caio_(moth)