Thallarcha isophragma (Meyrick, 1886)
(one synonym : Comarchis pallida Lucas, 1892)
LITHOSIINAE ,   ARCTIIDAE ,   NOCTUOIDEA
  
Don Herbison-Evans,
(donherbisonevans@outlook.com)
and
Stella Crossley

Thallarcha isophragma
female, drawing by George F. Hampson,

Catalogue of the Arctiadæ (Nolinæ, Lithosianæ) in the Collection of the British Museum,
Catalogue of the Lepidoptera Phalænæ in the British Museum,
Volume II (1900), Plate XXXIII, Figure 6,
image courtesy of Biodiversity Heritage Library, digitized by Smithsonian Libraries.

The adult moths of this species have off-white forewings, each with a broken dark area along the costa, many dark zigzag stripes which often blend together, and two black spots: one in each of two white areas. The hindwings are yellow darkening towards the wingtips, each with a dark splodge on the costa near the wingtip. The wingspan is about 2.5 cms.

The species has been found in :

  • Tasmania.


    Further reading:

    George F. Hampson,
    Catalogue of the Arctiadae (Nolinae, Lithosianae) in the Collection of the British Museum,
    Catalogue of the Lepidoptera Phalaenae in the British Museum,
    Volume 2 (1900), pp. 502-503, No. 1077, and also Plate 33, Figure 6.

    Thomas P. Lucas,
    On 34 new species of Australian Lepidoptera with additional localities,
    Proceedings of the Royal Society of Queensland,
    Volume 8, Part 3 (1892), pp. 74-75.

    Edward Meyrick,
    Revision of Australian Lepidoptera. I,
    Proceedings of the Linnean Society of New South Wales,
    Series 2, Volume 1, Part 3 (1886), pp. 739-740, No. 74.


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    (written 2 February 2015)