Arcas ducalis Leave a Comment / Insects, Lepidoptera, Natural History / By Nathan Smith [box] About this Taxon Common names: hairstreak butterfly Order: Lepidoptera Family: Lycaenidae Subfamily: Theclinae Genus: Arcas Species: Arcas ducalis [/box] [box] Collections & Observations Obs. N. P. Smith & M. A. Neves (14/02/2021). Det.: N. P. Smith (15/02/2021). [/box]