Zizula hylax (Fabricius, 1775)
(one synonym: Dipsas epijarbas)
Tiny Grass Blue
POLYOMMATINI , POLYOMMATINAELYCAENIDAE

Don Herbison-Evans ( donherbisonevans@yahoo.com )
&
Stella Crossley

(updated 13 May 2008)

Zizula hylax
(Photo: courtesy of Martin Purvis,
taken in the Royal Botanic Gardens, Sydney)

These Caterpillars are green with a dark red line along the back, and light and dark lines partway along the sides. The sides are hairy, and the head pale brown. The Caterpillars grow to a length of about 0.7 cm. They feed inside the fruits of :

  • Karamat ( Hygrophila angustifolia, ACANTHACEAE ), and
  • Ruellia tuberosa ( ACANTHACEAE ),

    exuding frass from the fruit entrance hole.

    The pupa is hairy and green, and has a length of about 0.7 cm. It is attached to a stem or the underside of a leaf of a foodplant.

    Zizula hylax
    male and female upper surfaces
    (Photo: courtesy of Yusuke Takanami & Yasuo Seki)

    The adult butterflies on top are dark brown fading to fawn on toward the wing bases, the males having a purple iridescence.

    Zizula hylax
    (Photo: courtesy of Martin Purvis,
    taken in the Royal Botanoic Gardens, Sydney)

    Underneath, both sexes are pale grey, with multiple arcs of brown dashes. The butterflies have a wing span of about 1.5 cms.

    Zizula hylax
    male and female undersides
    (Photo: courtesy of Yusuke Takanami & Yasuo Seki)

    The eggs are pale green, round, and flattened, with a diameter of about 0.5 mm. They are laid singly on buds and flowers of a foodplant.

    The species occurs as several races throughout tropical and subtropical Africa, Asia, and Oceania, including :

  • Japan,
  • the Philippines,
  • Singapore, and
  • Swaziland,

    and the subspecies attenuata occurs along the north and east coasts of Australia, including

  • New South Wales,
  • Northern Territory, and
  • South Australia.


    Further reading :

    Michael F. Braby,
    Butterflies of Australia, CSIRO Publishing, Melbourne 2000, vol. 2, pp. 841-842.


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