Hesperilla mastersi Waterhouse, 1900
Chequered Sedge-skipper
TRAPEZITINAE,   HESPERIIDAE,   HESPERIOIDEA
 
Don Herbison-Evans
(donherbisonevans@yahoo.com)
and
Stella Crossley

Hesperilla mastersi
(Specimen: courtesy of The Australian Museum)

This is a yellow Caterpillar with an orange thorax and tail, a dark line along the back, white lines along the sides, and a brown and black head. It feeds on Sword Grass species (CYPERACEAE) including:

  • Dark Fruited Saw Grass ( Gahnia melanocarpa ), and
  • Thatch Saw Sedge ( Gahnia radula ).

    The caterpillar constructs a shelter joining foodplant leaves with silk, where it rest by day, emerging to feed at night. It pupates within its shelter.

    The adult butterfly has brown wings, with off-white spots on the forewings, and an orange patch on each hind wing. The adults have a wingspan of about 4 cms. The males have a black line acros most of each forewing.

    Hesperilla mastersi
    underside
    (Specimen: courtesy of the The Australian Museum)

    The undersides of the wings are brown, marbled with white markings.

    Hesperilla mastersi
    egg, magnified
    (Photo: courtesy of Ken Walker, Hornsby, New South Wales)

    Eggs are pale yellowish-green and are dome-shaped with about 30 microscopic ribs. As hatching approaches, patches of other colours develop. The eggs have a diameter of about 1 mm. The eggs are laid singly on leaves of a foodplant.

    The species is found in the

  • southern Queensland,
    and along the coastal strip of
  • New South Wales, and
  • .
    It did occur in north-eastern Tasmania until the small area where its foodplant was growing was cleared to provide cattle pasture. It is probably now extinct in Tasmania.


    Further reading :

    Michael F. Braby,
    Butterflies of Australia, CSIRO Publishing, Melbourne 2000, vol. 1, pp 150-151.

    Gustavus Athol Waterhouse,
    Descriptions of new species of Australian Rhopalocera,
    Proceedings of the Linnean Society of New South Wales,
    Volume 25, Part 1 (1900) pp. 54-57, and also Plate 1, figs. 5-8.


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    (updated 28 July 2001, 5 January 2024)