acerces Prout comb. n.
acerces Prout, 1928, Bull. Hill Mus. Witley,
acerces Prout; Holloway, 1976: 34, partim (fig
crenulata Holloway, 1976: 34.
(paratype of Crenulata)
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.
range. Sumatra, Borneo, Taiwan (Yen, 1996), ?Java; Peninsular Malaysia (Zilli,
2001, as ‘near acerces').
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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