Arhodia lasiocamparia Guenee, 1857
(one synonym is: Nigasa subpurpurea)
OENOCHROMINAE, GEOMETRIDAE

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

(updated 16 May 2005)


(Photo: courtesy of Mike and Pat Coupar,
from: "Flying Colours", Coupar & Coupar, 1992)

This species is widespread in most of mainland Australia and Tasmania, where the larvae feed on

  • Gum Trees ( Eucalyptus, MYRTACEAE ).

    The Caterpillars are fawn, and have a knob on the tail. They have only two pairs of prolegs, and so move in a looper fashion. They normally rest motionless by day, and feed at night.


    pupa
    (Photo: copyright Cathy Young)

    The adult moths are brown, but have forewing patterns that are somewhat variable.


    Male
    (Photo: copyright Cathy Young)

    Some have a row of dark dots or a vague line running about 5 mm from the outside edge of the wing. There is a dark mark about halfway along the trailing edge of each forewing. The rear wings are more variable, ranging from a pink, through salmon to a drab pink tinged brown. A distinct diagonal line usually runs through the middle of each rear wing.


    Male
    (Photo: copyright Peter Marriott

    (updated 16 May 2005)Peter Marriott)

    Adult males often come to lights in October, November, December and January. Females rarely come to lights (less than 5%). The female wings are a slightly different shape, larger but similar colour to males. Also, the antennae of female is almost threadlike, whereas that of a male is obviously 'feathered'.


    Wings and one antenna of female
    (Photo: copyright Peter Marriott

    We have found the species in a variety of locations in Victoria:

  • coastal (Mt. Martha on Mornington Peninsula),
  • wet sclerophyll (Kallista in the Dandenong Ranges),
  • dry (Riddells Creek N-W of Melbourne, and
  • in north central Victoria (North of Yea, 600m).


    Male, underside,
    showing purplish blotch on underside
    (Photo: copyright Peter Marriott

    Both sexes have a large blotch on the underside of the forewing. The underside of the rear wing is a light brown. Male wingspan up to 6 cms, female 7 cms.


    eggs, magnified
    (Photo: copyright Cathy Young)

    The eggs are spherical and pale grey, and are laid in a flat irregular array.


    Further reading :

    Pat and Mike Coupar, Flying Colours, New South Wales University Press, Sydney 1992, p. 37.


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