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Ariola
Walker
Type
species: coelisigna
Walker, Borneo.
All species in this genus have the characteristic green and silvery grey
forewings. The venation is as in Labanda Walker except M3 and CuA1 are
stalked in the hindwing.
The male abdomen lacks basal tymbal structures, but tergites 2-4 have a
longitudinal zone of crinkled sclerotisation on each side that forms a groove to
enfold a hair pencil from the base of the abdomen in a group of species related
to the type species (Figs 447, 448). The eighth tergite and sternite each have a
pair of long apodemes (Fig 447).
In
the male genitalia the uncus is short, the gnathus and subscaphial band similar
to that of Labanda. The tegumen is long and distinctly swollen on each
side where it articulates with the vinculum, and bears long setae on enlarged
bases on the swelling. The valve is long and narrow, and the costa has a broad
border of inwardly directed, closely packed, peg-like structures. The aedeagus
is small, narrow.
In
the female, the ovipositor lobes are setose, marginally curved, together forming
a ring. The ductus and bursa are variable in form, the latter lacking a signum.
Five species occur in Borneo and are described below. The only species not
mentioned is an undescribed one from New Guinea (slides 17493, 17507).
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