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Hamadryas epinome
Aqui no Brasil é conhecida como Assenta Pau. Pois ela pousa com as asas abertas bem rentes aos troncos de madeira, onde ela se mimetiza.
Hamadryas feronia is found in Brazil, but not the subspecies Farinulenta. It is Hamadryas feronia feronia:
http://www.butterfliesofamerica.com/L/ih...
Feronia should have some "filled" spots on the hindwing and the 2 spots at the base of the hindwing should be "frosty"/filled.
Hamadryas februa should have some red lunules on the hindwing and the round spots should really be "round":
http://www.butterfliesofamerica.com/L/ih...
This is neither Feronia nor Februa but Hamadryas epinome. Note the missing red parts, the "empty" spots at the base of the hindwing, the more "rectangular" spots on the hindwing (the ones where Februa should have the red lunules), the 2 markable black spots at the outer parts of the forewing of which the second has more black in it as in the other 2 species.
http://www.flickr.com/photos/tichy_md/27...
http://www.butterfliesofamerica.com/L/ha...
Fyn Knyd's link does not list the Variable Cracker as occurring in Brazil.