Daemel's Blue, Dämel's Blue or Emerald Hairstreak (Jalmenus daemeli) is a butterfly of the Lycaenidae family. It is endemic to New South Wales and Queensland. It is most common in the coastal areas of southern Queensland. The wingspan is about 30 mm. The larvae feed on a wide range of plants, including Acacia species, Eucalyptus melanophloia and Heterodendrum diversifolium. The Caterpillars are attended by the ant species Iridomyrmex rufoniger.