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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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