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Dipterygina
Sugi
Type
species: japonica Leech.
In
facies species of Dipterygina resemble those of the genus Dypterygia Stephens
in their leaden grey forewings with a stepped pale zone to the dorsum that is
broadest at the tornus. The male genitalia of Dypterygia have a broad
apex to the valve that bears a corona and numerous additional stout setae. There
are trifine hair pencils in the abdomen.
Dipterygina
has weak
trifine hair pencils and very different male genitalia: the valves are loosely
membranous/corematous extensively over the basal part as in some Acronictinae
and taper to a narrow, unornamented, apical process; the tegumen is
diagnostically squarely shouldered; the juxta is triangular and over it the
band-like transtillae meet centrally; the aedeagus vesica is globular with a
single patch of short, heavy spines. The eighth sternite has a strongly, but
narrowly sclerotised distal margin enclosing a transverse hair pencil. It has
strong lateral rods.
The
female genitalia (vagivitta) have the setae of the ovipositor lobes based
in circular pale lacunae in the sclerotisation. The eighth segment is a ring
that
is narrowly unsclerotised ventrally. The ductus is slender, long, centrally
sclerotised, distally finely scobinate. The bursa is very finely scobinate
throughout, with a basal lobe opposite a patch of sclerotisation and a cornute
appendix bursae, also basal.
Sugi
(1987) illustrated the larva of a Japanese species. The colour varies from green
to brown, and there are black spots associated with the primary setae. Subdorsal
white lines broaden and extend dorsally onto a small transverse ridge or double
hump on A8. Whilst Dypterygia species feed mainly on Polygonaceae, Dipterygina
species have only been recorded from shrubs of the genus Callicarpa (Verbenaceae).
The
genus is only known from the Oriental Region and has three species in Borneo.
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