Miscellaneous Genera I
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Platyja umbrina Doubleday comb. n.
Iontha umbrina Doubleday, 1842, Entomologist, 1: 298.
Platyja rufiscripta Swinhoe, 1904, Trans. ent. Soc. London, 1904: 141.

Platyja umbrina Platyja umbrina Platyja umbrina

Diagnosis. The wings are highly modified in the male, the forewings rather narrower and more acutely produced apically than in the next two species and the triangular hindwings have a similarly acute apex and a tornus that is distinctly lobed. The abdomen extends well beyond the hindwings and has a conspicuous black tuft apically that arises from the valves of the genitalia. The wings are a uniform dark brown above, lacking the paler patch in the apex of the loop of the postmedial of the next two species. The wings sometimes grade slightly paler at the margin, but rarely with the blue irroration of the typical mainland Asian race. The females are more typical of the genus in facies, with the strongly looped postmedial much more clearly delineated on the forewing as illustrated, and with conspicuous, more or less straight submarginals that delimit a paler marginal zone. There is some variation, with uniform brown forms, and more variegated ones with extensive ochreous areas marginally and between the antemedial and submarginal on the forewing.

Taxonomic note. There has been some confusion in the past about the identity of the female of umbrina (Holloway, 1982; Sugi, 1982; Zilli, 2001). On the basis of concordance of geography and altitude range, and a comparable sexual dimorphism in the Sulawesi representative of the group (see below), the original suggestion by Tams (1924b) and Joannis (1929) that the taxon rufiscripta is based on the female of umbrina is considered correct, as indicated by Holloway (1982). An externally similar species from Sulawesi (slide 18317) has distinct male genitalia, particularly at the apex of the valve and in the ornamentation of the aedeagus vesica.

Geographical range. N.E. Himalaya, Vietnam, Thailand (VK), Hainan; Sundaland (ssp. rufiscripta).

Habitat preference. The species is infrequent in lowland forest, with singletons taken at 1000m (G. Mulu) and 1618m (Bukit Retak).

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