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Arctornis bilobuncus
sp. n.
Arctornis bilobuncus 
(holotype) |
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16mm. The wings are somewhat diaphanous, with a
sparse and irregular scattering of the broader scales in striae. There is a
small black discal spot on the forewing. The frons is broadly pinkish rufous
below the line of the antennae, with a white triangle notching this area
ventrally, or with a more restricted area of white. The palps grade ochreous
yellow towards the apex. The legs are not spotted. The male genitalia have the
uncus broad, bilobed and darkly rugose, a unique feature in the genus. The pair
of lateral processes of the aedeagus are well developed, the valves rectangular
with the apical margin slightly concave and a long straight, slender harpe that
extends just beyond the apex.
Holotype SARAWAK: Gunung Mulu Nat.
Park, R.G.S. Exped. 1977-8 (J.D. Holloway et al.) Site 23, April, W.
Melinau Gorge, 250m, 430558, FEG 4, limestone forest, BM lymantriid slide
1630.
Paratypes: 3
SABAH: Mt Kinabalu (Mesilau, 1500m; Park H.Q., 1620m, slide 1108; Kamborangoh, 2110m, slide 1111), vii-ix.1965, Cambridge Expedition to Mt
Kinabalu 1965 (H.J. Banks, H.S. Barlow & J.D. Holloway).
Geographical range. Borneo.
Habitat preference. The species is rare but recorded over a wide altitude
range, 250-2110m.
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