Exometoeca nycteris Meyrick, 1888
Western Flat
PYRGINAE ,   HESPERIIDAE ,   HESPERIOIDEA
 
Don Herbison-Evans,
(donherbisonevans@outlook.com)
and
Stella Crossley


(Specimen: courtesy of the Macleay Museum, University of Sydney)

These Caterpillars are initially yellow, later becoming green, with a darker line along the back. The head is initially black becoming brown then green, and developing a pair of short horns. The caterpillar feeds on :

  • Black-eyed Susan ( Tetratheca hirsuta ),
  • Slender Tetratheca ( Tetratheca hispidissima ),

    both of ELAEOCARPACEAE.

    The caterpillars often build a silk shelter under a curled leaf on the foodplant or on the ground nearby, in which they rest when not feeding.

    The pupa is green with a length of about 1.5 cms.

    This adult moth is brown with several small white spots on the forewings. Its wingspan is about 3 cms. It is a rather boring butterfly, but it has an unusual natural posture: the wings are extended downwards below the thorax so that the undersides are touching. The wingspan is about 3 cms.

    The eggs are pale brown, ribbed, and dome-shaped. Their diameter is about 0.8 mm. They are laid on the young shoots of a foodplant.

    The species occurs only in Western Australia.


    Further reading :

    Andrew F. Atkins, Andrew A.E. Williams, and Matthew R. Williams,
    Exometoeca nycteris Meyrick (Lepidoptera: Hesperiidae: Pyrginae) : life history and morphological studies,
    The Australian Entomologist,
    Volume 29, Part 1 (April 2002), pp 1-10.

    Edward Meyrick,
    Descriptions of new Australian Rhopalocera,
    Proceedings of the Linnean Society of New South Wales,
    Series 2, Volume 2, Part 4 (1888), p. 833.


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    (updated 15 December 2009, 22 September 2013)