Jalmenus eichhorni

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Phylum: Arthropoda
Subphylum: Hexapoda
Classis: Insecta
Subclassis: Pterygota
Divisio: Neoptera
Subdivisio: Endopterygota
Superordo: Panorpida
Ordo: Lepidoptera
Subordo: Glossata
Infraordo: Heteroneura
Divisio: Ditrysia
Sectio: Cossina
Subsection: Bombycina
Superfamilia: Papilionoidea
Series: Papilioniformes
Familia: Lycaenidae
Subfamilia: Theclinae
Tribus: Zesiini
Genus: Jalmenus
Species: Jalmenus eichhorni

The Northern Hairstreak or Northern Imperial Blue (Jalmenus eichhorni) is a butterfly of the Lycaenidae family. It is endemic to Queensland, including Cape York.

The wingspan is about 30 mm.

The larvae feed on a various Acacia species, including Acacia crassicarpa, Acacia leptocarpa, Acacia humifusa and Acacia holosericea.

The Caterpillars are attended by the ant species Iridomyrmex gracilis, Iridomyrmex reburrus and Iridomyrmex sanguineus.