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Nudaria phallustortens sp. n.

Nudaria phallustortens
(x 1.63)

, 8-10mm. Externally, this species could be confused with Schistophleps nigropuncta, having a black discal dot and rather elongate forewings, but it can be distinguished on venation features, and different distribution of fulvous brown markings on the forewings, mostly as curved antemedial and postmedial fasciae flanking the discal spot and a rather tridentate submarginal patch. In these features it is similar to N. discipuncta Hampson (N.E. Himalaya), but differs in genitalic characters. In both, the aedeagus is elongate, slender and tortuous, but this is considerably more extreme in the new species, which also has broader, apically quadrate valves (both have a slight saccular lobe in this apical portion). The spined neck and distal part of the bursa are similarly elongate, with an extensive helical portion beyond the spined section (which has an appendix bursae towards its distal end); again, both the spined and helical sections are much longer in the new species.

Holotype .SABAH: Mt. Kinabalu, ‘Power Station’, 1930m, vii-ix. 1965, Cambridge Expedition to Mt. Kinabalu 1965 (H.J. Banks, H.S. Barlow & J.D. Holloway), BM arctiid slide 5149.

Paratypes: 1, 4 (slide 5182) SABAH: Mt. Kinabalu, 5500ft., 17-19.i.1976 (E.W. Classey); 1 SABAH: Mt. Kinabalu, 30.vii-3.viii. 1979 (E.W. Classey); 1 (slide 5147) BRUNEI: 1670m, Bukit Pagon, montane forest, Feb.1982 (Allen & Harman); 1 SARAWAK: Gunong Mulu Nat. Park, R.G.S. Expéd. 1977-8 (J.D. Holloway et al.), Site 1, January, Camp 4, Mulu, 1790m. 452463, [upper] montane (moss) forest.

Geographical range. Borneo, Peninsular Malaysia (slide 5127), ?Java (see Nudaria sundamollis sp.n.).

Habitat preference. This is a montane species, with most records from about 1600m to 2000m, but with one specimen taken at about 600m.

Biology. This may be the Javan species referred to Nudaria discipuncta by Piepers & Snellen (1904) who described the pupation of the mature larva within a circular palisade of long, stiff hairs. The brown-spotted, green, rather pointed pupa with an angular head is formed in the centre of this. The larva was found on a variety of plants but had never been noted to feed on them. The biology of the related N. ranruna Matsumura (Taiwan) was described by Nishihara (1992a). The larva has tufts of long (longer than the body width) setae on small, well separated verrucae. It feeds on the leaf tissue of Symplocos (Symplocaceae), Eurya and Cleyera (Theaceae), plant families favoured also by the prismostictine Bombycidae (Holloway, 1987).

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