Gulf Fritillary Butterfly

The Gulf fritillary or passion butterfly (Agraulis vanillae) is a bright orange butterfly of the family Nymphalidae and subfamily Heliconiinae. That subfamily was formerly set apart as a separate family, the Heliconiidae. The Heliconiinae are "longwing butterflies", and like other longwings this species does have long, rather narrow wings in comparison with other butterflies. It is not closely related to the true fritillaries, however. It is the only member of genus Agraulis.

http://en.wikipedia.org/wiki/Gulf_fritillary