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Yula
Bethune-Baker
Gen. rev.
Type species: novaeguineae
Bethune-Baker, New Guinea, Seram, Bismarcks.
This genus contains
a number of species restricted to New Guinea (submarginata Warren comb.
n., tenuilinea Warren comb. n., argyrospila Warren comb.
n., moneta Warren comb. n.) that have sometimes been
associated with Euplexia Stephens, for example as in Warren's treatment
in Seitz, Gross-Schmett. Erde 11: 147. In facies they resemble somewhat
species of the Oriental genus Karana Moore Gen. rev. (type species
decorata Moore, India; gemmifera Walker is congeneric), another distinct
genus placed within Euplexia by Warren. Both are distinct in male
genitalic characters and not at all closely related to Euplexia. Karana has
the uncus modified into an incomplete tube, bearing numerous brushes of setae;
the harpes are bilaterally asymmetric; there is an exterior subapical spur to
the valve or one at the apex, and a stout seta ventrally just basal to a
interior apical field of setae; trifine hair pencils are present as in Yula.
Both genera have green and black forewings with a white reniform and a white
antemedial bar from which arises a white claviform stigma.
Yula is
distinguished by the following features of the male genitalia: a broad, rounded
apex to the valve with an interior field of setae and a corona; the costal
margin is apically falcate; there is a small spur subapically on the ventral
margin; the harpe is small, flat, ampullate; the uncus is slender, tapering,
with a few small, short, broad spines at the apex; the peniculi are expanded
into long lateral wings, each with a further small ventral, subbasal lobe; the
aedeagus vesica is moderate, with one large cornutus distally as well as fields
of scobination and sometimes groups of smaller cornuti. The eighth sternite has
lateral rods (also in Karana). Between the fourth and fifth tergites in
the type species, muscosa Hampson and argyrospila Warren is a
centrally broken, narrow, darkly sclerotised, scobinate band. The female
genitalia have a small appendix bursae that is sclerotised along with the basal
section of the bursa; there are no signa.
One Oriental species is here added to the New Guinea complex.
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