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Arctornis naphtha sp. n.  

Arctornis naphtha (holotype)

16-17mm, 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.

Holotype  BORNEO: Sabah, Danum Valley, 5 01N, 117 47E, 30.ix.1987, 150m (A.H. Kirk-Spriggs) BM lymantriid slide 2160.

Paratypes: 3 as 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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