Urbanus dorantes, the lilac-banded longtail or Dorantes longtail, is a species of butterfly in the family Hesperiidae. It is found from Argentina, north through Central America, Mexico, and the West Indies to southern Texas and peninsular Florida. The wingspan is 37–51 mm. The larvae feed on various legumes, including wild and cultivated Phaseolus species, Desmodium and blue peas Clitoria. Adults feed on flower nectar from various plants, including shepherd's needle, lantana, trilisa, ironweed, and bougainvillea.

From Wikipedia article at https://en.wikipedia.org/wiki/Cecropterus_dorantes, which is released under the Creative Commons Attribution-Share-Alike License 3.0.