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Gesonia Walker
Type
species: obeditalis Walker,
Sri Lanka.
Synonyms: Amblygoes
Butler
(replacement name for Apphadana); Apphadana Walker
[1866] 1865 (nec Walker 1865; type species evulsalis Walker,
Sri Lanka = obeditalis)
praeocc.;
Dragana
Walker
(type species pansalis Walker,
Sri Lanka = obeditalis);
Hemipsectra
Hampson
(type species plumipars Hampson,
India); Hileia Walker
(type species crambisata Walker,
India = obeditalis);
Maresia
Walker
(type species binotata Walker,
Moluccas = obeditalis).
This
genus consists of fawn or straw-coloured species, usually with a series of fine
pinkish or brownish fasciae approximately parallel to the margin on all the
wings, the postmedial being the most prominent. The male antennae can be
bipectinate or fasciculate.
The male
abdomen does not provide any clear generic features. The eighth tergite has
broad apodemes and the sternite has a broadly ovate, slightly corematous lacuna
at its anterior end. In inscitia Swinhoe
the lacuna of the sternite is longer and narrower, and the tergite has a narrow
central sclerotised strip from which more slender apodemes diverge, and distally
is slightly pouched as in a number of other genera (see p. 16). The genitalia of
obeditalis have a discal process to the uncus, and the valves
are deeply divided, with an irregular, setose knob at the base of this division.
In plumipars the uncus is more elongate, otherwise unmodified, and
the valve is oval, undivided, though with a setose knob in a similar position
from the base. In inscitia this knob is absent and the valve is asymmetrically
broadened and bilobed apically.
In the
female of obeditalis, the bursa is short, the ductus slender, and the
ostium is elongated narrowly through the eighth segment.
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