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Hamadryas feronia, the blue cracker or variable cracker, is a species of cracker butterfly in the family Nymphalidae. It is found in the southern parts of North America and South America and southwards Brazil.
Hamadryas feronia is similar in appearance to Hamadryas guatemalena and Hamadryas iphthime. The upperside of the fore wing is a mosaic pattern of white, brown and bluish-grey, with a row of small eyespots parallel with the outer margin; a small red bar occupies the discal cell. The upperside of the hind wing is similar but has few white patches and larger more distinct eyespots. The underside of the fore wing is white or whitish-tan with dark markings, a small red bar and a black submarginal eyespot, and the under hind wing is white or whitish-tan, with dark markings and blue rings containing larger eyespots near the rear margin.
The larva has two colour morphs; it is either bluish-black above with brownish-white speckles and reddish spots on the side, or it is greyish-green with a pale-coloured longitudinal line on the side. It has dorsal spines on the second and third thoracic segments and on the seventh and eighth abdominal segments. The pupa has two long processes on its anterior end.
Two subspecies are recognised; H. feronia feronia occurs in Brazil, Paraguay and Peru, and H. feronia farinulenta occurs in Mexico, Honduras, Venezuela, Colombia and Trinidad. This butterfly is found in open areas with trees.
