We recorded the hairstreak butterfly, Atlides halesus (Cramer) (Lepidoptera: Lycaenidae), for the first time in the state of Hidalgo, Mexico. This species presents large morphological variations (wing patterns and number of tails) within its distribution range. The distribution range includes 870 records of occurrence, which are displayed on a map of Mexico. The range size includes 870 records in databases that include the previous records for the country (15 sites), and with this information we elaborated a distribution of the species in Mexico.