Looks like what's called the "Gulf Fritillary",
Agraulis vanillae. See for example
this article in Wikipedia, or search Google for a zillion more
images.
The Wikipedia article also has a picture of the pupa (chrysalis). Notice that in these butterflies the pupa hangs head down suspended only from the tail -- no silk girdle. When the adult emerges, it crawls out head up and hangs that way until the wings are fully expanded.
--Rik