Miscellaneous Genera I
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Platyja acerces Prout comb. n. 
Iontha acerces Prout, 1928, Bull. Hill Mus. Witley, 2: 261.
Iontha acerces Prout; Holloway, 1976: 34, partim (fig 209).
Platyja crenulata Holloway, 1976: 34.

Platyja acerces

Platyja acerces
(paratype of Crenulata)

Diagnosis. Males of this and the next species are very similar in external appearance, having a shorter abdomen than umbrina and more triangular hindwings, the distal angled less produced. In the larger acerces the abdomen protrudes further beyond the hindwing margin than in the next species, which lacks a conspicuous apical tuft, and the hindwing margin is more extensively suffused with pale blue, particularly towards the tornus. The male genitalia are diagnostic as illustrated, those of acerces being larger, more robust, and with the diverticula of the aedeagus vesica larger and more heavily ornamented. The rami of the antennae are relatively shorter. The wings of the female (described separately as crenulata by Holloway (1976) but associated with acerces by Yen (1996)) are rufous brown, with fasciation typical of the genus; the loop of the postmedial encloses a broadly darker band, and the brown grades darker to the margins of the wings, where there is a sequence of mauve and dark brown fasciae as illustrated.

Geographical range. Sumatra, Borneo, Taiwan (Yen, 1996), ?Java; Peninsular Malaysia (Zilli, 2001, as ‘near acerces').

Habitat preference. All Bornean specimens seen are from G. Kinabalu, one from 1200m, one from 1620m and four, including the type material of crenulata, from 1930m. A further female was illustrated by Sugi (1982).

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