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Arctornis brunnescens sp. n.  

Arctornis brunnescens (holotype)

14-16mm. This and the next three species are all related to A. flavescens Moore comb. n. (Andamans), having similar features of the male genitalia: a rather setose, triangular uncus, a long, spine-like process from the base of the valve costa and usually some modification to the dorsal saccular margin at the base of the harpe. The facies is also very similar, the white of the wings tinged faintly brownish, and the forewing with a rather mottly reflectivity. There is
some greying in the spaces at the margins of both fore-and hindwings. The head, dorsal side of the palps and upper half of the foretibia are brown in this species. The male genitalia have both costal process and harpe gently upcurved, apically acute (the harpe is irregular and more setose in flavescens), and there is a small, acute spine on the dorsal margin of the sacculus.

Holotype SARAWAK: Gunung Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.) Site 8, February, Camp 1, Mulu, 150m, 385470, mixed dipt. for., BM lymantriid slide 1627.

Paratypes: 5 (slide 1620) as holotype; 1 as holotype but Site 11; 3 (slide 2096) BRUNEI: 3m, Seria, secondary and coastal veg., 16.11.79 (Lt. Col. M.G. Allen); 1 BRUNEI: Swamp forest, Seria, 20m, 8.iv.1981 (T.W. Harman).

Geographical range. Borneo.

Habitat preference. All specimens are from lowland forest, including swamp and coastal forest.

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