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Arctornis semihyalina Swinhoe comb. n.  
Leucoma semihyalina Swinhoe, 1904, Ann. Mag. nat. Hist., (7) 14: 421.
Leucoma lepta Collenette, 1932, Mem. Mus. Royal Hist. nat. Belg. (Hors serie) 4 (6): 47, syn. n.

Arctornis semihyalina(Java)

This is a rather translucent species similar to niphobola, though it lacks the patches of denser scales, but fresh specimens may have short, transverse, narrow, irregular, striae of denser scales. There is a small black discal dot on the forewing. The frons is entirely brown, the palps paler brown. The forelegs are also pale brown without darker patches. The male genitalia are distinctive, with a rather humped uncus, a very short, acutely bifid harpe and a much longer spine arising from the base of the valve costa.

Taxonomic note. The Sulawesi taxon lepta is best placed as a subspecies. The genitalia are very similar to typical semihyalina except the saccular spining is reduced to only a slender distal spine the same length as that of the typical race.

Geographical range. Sundaland; Mindanao (slide 2174; a much longer outer spine to the tongue); Sulawesi (ssp. lepta); S. Moluccas (slide 2120), New Guinea.

Habitat preference. The species is not common, but most records are from lowland localities such as Kretam in Sabah, Labuan I. and the Ulu Temburong of Brunei. One specimen has been taken at 1200m near Bundu Tuhan on G. Kinabalu.

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