Arctornis naphtha sp.
19-20mm. This and the next five species are
characterised by a number of features that set them apart as a group. The rather
broad, somewhat rounded forewings have irregularly reflective transverse bands
that give the impression that they have been mottled with crystalline flakes of
naphthalene. The discal dot, if present, is faint. The male genitalia have a
cupola-shaped uncus, and valves that are narrow, often tapering, with the harpe
short, broad, often with robust setae, and not conspicuously based in a saccular
pocket. In naphtha the frons and palps are extensively rufous and the
legs unspotted as in rufimarginata which differs in having dense, fine
wing scales with no mottled satiny reflection. The male genitalia of naphtha have
the valve apex irregularly rounded with a corona of setae. The harpe is a small
lobe with three to four very robust setae.
Valley, 5º 01N, 117º 47E, 30.ix.1987, 150m (A.H. Kirk-Spriggs) BM
lymantriid slide 2160.
holotype, but 10.ix. 1987, 100m.
Other material. Four further males from the same locality were dissected (slides 2102,
2114 and in gelatine capsules) but the specimens were destroyed by Anthrenus.
One further possible female was taken by S.J. Willott in the Danum area, and
another at Labi in the lowlands of Brunei.
Geographical range. Borneo.
Habitat preference. All material is from lowland dipterocarp forest.
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