Ypthima arctous (Fabricius, 1775)
Dusky Knight
(one synonym : Yphthima arctoides Hewitson, 1865)
SATYRINAE ,   NYMPHALIDAE ,   PAPILIONOIDEA
  
Don Herbison-Evans
(donherbisonevans@outlook.com)
and
Stella Crossley


(Photo: courtesy of Nick Monaghan, Tewantin, Queensland)

The Caterpillar of this species feeds on various grasses ( POACEAE ) and happily accepts :

  • Cogon Grass ( Imperata cylindrica ),
  • Blue Couch ( Digitaria didactyla ), and
  • Kangaroo Grass ( Themeda triandra ).

    The caterpillars are hairy. Initially the caterpillars are buff coloured. Later instars are green, and the last instar has darker lines along the body. The caterpillar has a pair of horns on the tail. It grows to a length of about 2 cms.

    The pupa is suspended head down from a cremaster. It can be any colour from green to brown, and has brown markings.


    (Photo: courtesy of Martin Purvis, Ingleburn, New South Wales)

    The adult is dark brown with an eyespot on each wing. The eyespots on the forewings have two blue spots in them. The undersides are similar to the upper surfaces but a little paler. The wingspan is about 3 cms.


    mating couple
    sorry about the dark line shadow of the grass stem
    (Photo: courtesy of Nick Monaghan, Tewantin, Queensland)

    The eggs are green and approximately spherical.

    The species occurs in

  • Indonesia, and
  • Papua New Guinea,

    and also in Australia in

  • Northern Territory,
  • Queensland,
  • New South Wales, and
  • Victoria.


    Further reading :

    Michael F. Braby,
    Butterflies of Australia,
    CSIRO Publishing, Melbourne 2000, vol. 2, pp. 478-479.

    Johan Christian Fabricius,
    Historiae Natvralis Favtoribvs,
    Systema Entomologiae (1775), p. 489, No. 202.

    Wesley Jenkinson,
    Life history notes on the Dusky Knight, Ypthima arctous (Fabricius, 1775) Lepidoptera: Nymphalidae,
    Metamorphosis Australia,
    Issue 67 (December 2012), pp. 14-16,
    Butterflies and Other Invertebrates Club.

    Ross Kendall,
    A new location for the Dusky Knight, Ypthima arctous (Fabricius, 1775) (Lepidoptera: Nymphalidae: Styrinae),
    Metamorphosis Australia,
    Issue 63 (December 2011), p. 33,
    Butterflies and Other Invertebrates Club.

    Buck Richardson,
    Tropical Queensland Wildlife from Dusk to Dawn Science and Art,
    LeapFrogOz, Kuranda, 2015, p. 231.


    previous
    back
    caterpillar
    Australian
    Australian Butterflies
    butterflies
    Australian
    home
    caterpillars
    Australian
    Australian Moths
    moths
    next
    next
    caterpillar

    (updated 7 May 2008, 13 December 2013, 17 March 2015)