Jalmenus ictinus, the Ictinus blue or stencilled hairstreak, is a butterfly of the family Lycaenidae. It is found in Australia in the Australian Capital Territory, New South Wales, Queensland and Victoria.

Jalmenus ictinus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Lycaenidae
Tribe: Zesiini
Genus: Jalmenus
Species:
J. ictinus
Binomial name
Jalmenus ictinus
Hewitson, [1865]
Synonyms
  • Ialmenus ictinus Hewitson, 1865
  • Austromyrina schraderi Felder, C. & Felder, R. 1865
  • Ialmenus ictinus kooronya Edwards, 1956
  • Ialmenus ictinus penunga Edwards, 1956

The wingspan is about 30 mm.

The larvae feed on a various Acacia species, including A. bidwillii, A. dealbata, A. decurrens, A. harpophylla, A. implexa, A. mearnsii, A. melanoxylon, A. pendula and A. rubida, as well as Heterodendrum diversifolium.

The caterpillars are attended by the ant species Iridomyrmex purpureus and Iridomyrmex spadius.

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