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Arctornis rugosacculus sp. n.  

Arctornis rugosacculus (holotype)

14mm. The facies is similar to that of brunnescens, including the frons and palp colour, but the male genitalia are distinctive. The harpe is more slender and distinctly downturned at the apex. The sacculus has a diagnostic, rugose, leaflike plate arising from it.

Holotype  BRUNEI: LP 298, Temburong, 300m, 5.x.1978 (T.W. Harman), BM lymantriid slide 2158.

Geographical range. Borneo.

Habitat preference. The only specimen is from lowland dipterocarp forest.

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