Urbanus dorantes, the lilac-banded longtail or Dorantes longtail, is a butterfly of the family Hesperiidae. It is found from Argentina, north through Central America, Mexico, and the West Indies to southern Texas and peninsular Florida. Strays can be found as far north as northern California, southern Arizona, southern Missouri and North Carolina. The wingspan is 37–51 mm. There are three to four generations throughout the year in southern Florida and southern Texas. 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.