Palaeosia bicosta (Walker, 1854)
(one synonym: Lithosia fraterna)
Two-Ribbed Arctiid
LITHOSIINAE , ARCTIIDAE , NOCTUOIDEA

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

(updated 19 April 2008)

Palaeosia bicosta larva
(Photo: courtesy of Merlin Crossley)

This Caterpillar has long fine black and white hairs, which appear to be non-irritant. Its body is mottled in black, yellow, and grey. Its head and legs are red. Our specimen was found on a window sill inside the house. It was raised on

  • Lichen

    growing on damp pieces of bark from an old apple tree. The Caterpillar grew to a length of 3 cms.

    It pupated inside a cocoon which it spun amongst the twigs.

    Palaeosia bicosta
    (Photo: courtesy of Merlin Crossley)

    The photograph shows the stiff posture characteristic of the Lithosiinae, or "Footmen", which are a sub-family of the ARCTIIDAE. The adults have a wingspan up to 3 cms. The fore wings are grey-brown with a cream line along the leading edge (costa), and a small transparent window (aereole) on each wing. The hind wings are orange. The absence of yellow marks in the centre of the fore wing distinguishes it from the similar moth: Manulea replana.

    Palaeosia bicosta
    (Specimen: courtesy of the The Australian Museum)

    The species is found over south-eastern Australia including:

  • South Australia,
  • Tasmania, and
  • Victoria.


    Further reading :

    Ian F.B. Common,
    Moths of Australia, Melbourne University Press, 1990, p. 437.

    Pat and Mike Coupar,
    Flying Colours, New South Wales University Press, Sydney 1992, p. 33.


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