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Thalathoides
Gen. n.
Type
species: conjecturalis Swinhoe.
This
genus has forewing facies as in Thalatha but with a subapical costal dark
triangle and a strong, rather angled basal streak; the subtornal streak differs
in intensity in the two species but is an angled black mark, rather than a row
of black triangles. There is slight sexual dimorphism in the hindwing, that of
the male tending to be narrower, with a stronger central curvature to the
margin, and a paler costal zone.
The
male genitalia provide most definitive features: a long, slender, spine-like
harpe articulating subcostally, with an extensive, long, weakly membranous
saccular zone ventral to it; at the base of this saccular zone is a short corema
bearing long hairlike setae. The apical part of the valve has a distinct
cucullus bearing dorsolaterally directed setae; the aedeagus vesica is small,
with a large, subbasal, curved cornutus from which a crinkled sclerotised band
extends distally to a cluster of very much smaller cornuti. The male abdomen
lacks the trifine hair pencil; the apodemes of the basal sternite are
convergent; there is a small central, subbasal corema on sternite 8, which also
has lateral rods.
The
female genitalia have the bursa finely scobinate but with no signa; there is a
short basal appendix bursae. The ductus bursae is slender, with a globular
lateral sac within which is a curved, scrolled sclerotisation, presumably a
receptacle for the large cornutus of the male vesica.
The
larva resembles that of Craniophora and Thalatha in general
features.
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