Risoba obstructa Moore, 1881
(one synonym : Risoba grisea Bethune-Baker, 1906)
SARROTHRIPINAE ,   NOLIDAE ,   NOCTUOIDEA
 
Don Herbison-Evans
(donherbisonevans@outlook.com)
and
Stella Crossley

Risoba obstructa
drawing by Frederic Moore, The Lepidoptera of Ceylon,

L. Reeve, London, Volume 3 (1886), Plate 144, fig. 2c,
image courtesy of Biodiversity Heritage Library, digitized by Smithsonian Libraries.

These Caterpillars are purplish-brown, with pale streaks along the body, and a hump on the tail. They have have been recorded on plants from many families, including:

  • Terminalia ( COMBRETACEAE ),
  • Xylia ( FABACEAE ),
  • Lagerstroemia ( LYTHRACEAE ) and
  • Sterculia ( STERCULIACEAE ).

    Risoba obstructa
    drawing by Frederic Moore, The Lepidoptera of Ceylon,

    L. Reeve, London, Volume 3 (1886), Plate 144, fig. 2c,
    image courtesy of Biodiversity Heritage Library, digitized by Smithsonian Libraries.

    The cocoon is dark purple, and is smoothly attached to a stem.

    Risoba obstructa
    (Photo: courtesy of Buck Richardson, Kuranda, Queensland)

    The adult moth of this species is greyish-brown with a dark subterminal line and a number of dark marks toward the tip of each forewing. The hindwings are buff coloured with broad dark margins. The males have a wingspan of about 2.5 cms. The females have a wingspan of about 3 cms.

    Risoba obstructa
    male, drawing by Frederic Moore, The Lepidoptera of Ceylon
    ,
    L. Reeve, London, Volume 3 (1886), Plate 144, fig. 2,
    image courtesy of Biodiversity Heritage Library, digitized by Smithsonian Libraries.

    The species has been found across south-east Asia, including

  • Borneo,
  • India,
  • New Guinea,
  • Sumatra,
  • Thailand,

    and Australia in

  • Queensland.

    Risoba obstructa
    male, drawing by George Francis Hampson, listed as Risoba grisea
    ,
    Catalogue of Lepidoptera Phalænæ in the British Museum,
    Volume XI, 1912, Plate CLXXXVI, figure 5,
    Image courtesy of Biodiversity Heritage Library, digitized by Ernst Mayr Library, Harvard University.


    Further reading :

    Frederic Moore,
    Descriptions of new genera and species of Asiatic nocturnal Lepidoptera,
    Proceedings of the Zoological Society of London,
    1881, pp. 328-329.

    Frederic Moore,
    The Lepidoptera of Ceylon,
    L. Reeve, London, Volume 3 (1886), p. 2, and also Plate 144, fig. 2.

    Buck Richardson,
    Tropical Queensland Wildlife from Dusk to Dawn Science and Art,
    LeapFrogOz, Kuranda, 2015, p. 172, listed as Risoba grisea.


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    (updated 29 October 2011, 1 May 2016)