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Pseudogyrtona Bethune-Baker
Type
species: fulvana Bethune-Baker,
New Guinea, Seram.
This
genus has, since it description, accumulated numerous species (Poole, 1989) that
prove to be unrelated to the type species. Four have been transferred to Chorsia as
discussed above: hemicyclopis Hampson; octosema
Hampson;
perversa
Walker; trichocera
Hampson).
The complex around modesta Moore,
discussed below, is probably also misplaced. The genus may prove to be
restricted, if not to the type species, at least to those with facies resembling
the stictopterine genus Gyrtona Walker, most of which are found in the Australasian
tropics.
The type
species has narrow brown forewings that are paler longitudinally along the
costal third, posterior to which is a dark brown zone in the cell interrrupted
by an oblique fawn triangle that is paler than the rest of the wing. The
forewing does share with Chorsia the subapical pale spot on the forewing
underside, but the features of the male abdomen differ considerably.
The male
abdomen has the eighth sternite with coremata in a longitudinal frame of
sclerotisation, weakest and broadest distally with bands of sclerotisation
extending laterally on each side just distal to the anterior margin. The tergite
has a somewhat heart-shaped sclerotisation, with the point directed anteriorly.
The genitalia have the valve bases separated (adjacent or fused in Chorsia),
and the valves themselves are large, triangular, the distal angles being
extended into a dorsal lobe and a ventral spine.
The
female genitalia have the eighth segment ventrally in a V-shape, the apex
anteriorly at the ostium where it is situated concealed by a slight tongue at
the apex of the reduced, triangular seventh sternite. The posterior margins of
the eighth segment is lined with setae laterally. The ductus bursae is long,
narrow, tubular. The corpus bursae is pyriform, set asymmetrically on the ductus
through a slight and tight coil, and densely spined within, the spines short but
robust.
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