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Ugia Walker
Type
species: disjungens Walker,
Singapore.
Synonyms: Iluza
Walker
(type species decisa Walker,
India); Sarthida Walker
(type species signifera Walker
= disjungens).
Males in
this genus and the next have long, bipectinate antennae. The hindwing margin is
slightly angled at vein CuA2. The male legs are not conspicuously tufted in
either genus. The facies of the two genera is also similar, with a strong,
oblique postmedial fascia extending from the forewing apex to the centre of the
dorsum, and being continued on the hindwing medially. This fascia is often
slightly doubled in Ugia, the inner component usually being strongly angled basad
subcostally on the forewing, though this is much more obscure than the rest of
the fascia. There is a more diffuse submarginal in both genera, distinctly
stepped on the forewing but more irregular on the hindwing.
In the
male abdomen the eighth tergite is bilobed around a central, X-like thickening,
and the sternite is more elongate, thickened by a long central rod that diverges
into a triangle posteriorly, and is bifid with two additional lateral rods
anteriorly. Between the lateral rods and
the posterior triangle, there is an extensive scale-bearing zone on each side.
The genitalia are very elongate and narrow as illustrated, but have the typical
catocaline inverted V- or Y-shaped juxta. The valves are simple, constricted
near the base of the costa, where there is a simple, digitate process.
In the
female, the ostium is between the seventh and eighth segments, the seventh
sternite large, but slightly shorter than the tergite at the posterior margin.
The ductus is long and the bursa relatively short, ovate, neither strongly
sclerotised, and the latter with the ductus seminalis arising as a slight
appendix subbasally.
The
genus is diverse in the African and Oriental tropics. Several species were taken
by S.J. Willott (unpublished data) in the vicinity of the Danum Valley Field
Centre. All were predominantly taken in the forest understorey. See also Tochara
creberrima Walker
(p. 266), a species where males also have long, bipectinate antennae.
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