Hampson comb. n.
Nanaguna albisecta Hampson, 1905, Ann. Mag. nat. Hist. (7), 16: 583.
Moore, 1885, Lepid. Ceylon, 3: 105, praeocc. (see basalis Walker above), syn. n.
Diagnosis. This and the next species, vittalis Walker, show a similar
sexual dimorphism of the forewing facies, but males of vittalis have a
more angled antemedial and a more conspicuous distal pale edging to the anterior
side of the postmedial. Females of vittalis are larger, brighter, with a
somewhat more conspicuous pale edge (paler brown zone anterior to it) dividing
the forewing longitudinally in half, that does not curve so sharply towards the
costa at its basal end; there is a dark brown edging to the dorsum in the medial
zone, rarely evident in albisecta. The male genitalia of the two species
are very similar, but vittalis has a double arch structure just ventral
to the uncus between the sides of the tegumen. In females the bursa is larger,
with the spining more distinctly on one side.
The synonymy above reflects the sexual dimorphism
of the species, albisecta being based on males and basalis on
females. As the latter is subjectively preoccupied by
Walker (see above), albisecta is an available replacement name.
Geographical range. Indian Subregion to Queensland and the Solomons.
Habitat preference. Five specimens have been taken in recent surveys, two
from a coastal area with mangrove in Brunei, one from lowland forest at Semengok
in Sarawak, one from 900m on the limestone G. Api during the Mulu survey, and
the last from 1618m on Bukit Retak in Brunei.
Biology. Robinson et al. (2001) noted Buchanania (Anacardiaceae)
as a larval host.
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