SUBFAMILY HADENINAE
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Athetis thoracica Moore comb. n., stat. rev.
Radinacra thoracica Moore, 1884, Lep. Ceylon, 3: 31.
Leucocosmia ceres Butler, 1886, Trans. ent. Soc. Lond., 1886: 394.
Caradrina euthusa Hampson, 1891, Illustr. typ. specimens Lepid. Het. Colln Br. Mus., 8: 79.
Caradrina heliarcha Meyrick, 1897, Trans. ent. Soc. Lond., 1897: 370.
Caradrina unipunctata Bethune-Baker, 1906, Novit. zool., 13: 201.
Leucocosmia nonagrica Walker auctorum (Zimmerman, 1958; Robinson, 1975; Holloway, 1979).


Athetis thoracica

Athetis thoracica

 


Diagnosis.
This and the next species are very similar. Both have males distinctive within Athetis in having a large basal area of the forewing buff, contrasting with the grey of the rest of the wing. The hindwings are at least partially slightly nacreous, with the veins picked out darker, a feature absent from other Bornean Athetis. The two species are distinguished from each other in the diagnosis of the next.

Geographical range.
Indo-Australian and Pacific tropics.

Habitat preference.
The species is frequent in open habitats, particularly in the lowlands. Confusion with the next species has prevented a clear picture of any habitat segregation between the two.

Biology.
The life history was described in great detail by Zimmerman (1958; after Swezey). The egg is hemispherical with 30 meridional ribs and faint crossridges. It is green with a red patch at the apex and a ring of the same colour one third from apex to base.

The first instar larvae are blackish with prominent setae; they move in 'semi-Looper' fashion. The second instar is mottled reddish green.

Later instars are mottled greenish and blackish with some red, and with subdorsal white lines. A8 is humped and has two white spots dorsally as has A2. Instars become progressively darker and more variegated with black brown, olive green, yellow and white.

Pupation is in the soil.

Host-plants recorded (Zimmerman; Robinson, 1975; CIE records) are:
Commelina (Commelinaceae); Ipomoea (Convolvulaceae); Syzygium (Myrtaceae); Portulaca (Portulacaceae); Nicotiana (Solanaceae); Camellia  (Theaceae) and unspecified Gramineae and Leguminosae.

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