Although the Dark Zebra Swallowtail is a common butterfly, the Jamaican Kite Swallowtail or Zebra Swallowtail, also known as Eurytides Marcellus (which is the type crocheted in the example above) is classified as Vulnerable in the Red Data Book of Threatened Swallowtail Butterflies of the World.
Free chart of this butterfly can be printed from http://crochet.about.com/nbgraph1.htm
Butterfly design copyright (c) 1997 by Sandi Marshall, licensed to About.com, Inc. Per copyright law, do not redistribute chart or my photo of butterfly square, in any form. You may give the web page link to others, so that they may come to this site to print out the free chart for themselves. Thank you. Pattern is free for your own personal (not for profit) use only.