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Thysanoptyx
Hampson
Type species: tetragona Walker,
Bangladesh.
This genus was treated as
distinct by Kishida (1993). The forewing facies, with a central quadrate black
zone that does not reach the costa, is somewhat similar to that of some of the
typical group in Teulisna. The male has the forewing venation modified,
with the cell extended to about four fifths the length of the wing and with all
veins except R1 and CuA2 arising from its distal extremity; the others arise
from near the centre of the cell which is folded and thus narrowed over its
length and overlapped by a narrow rectangle of pale scales from Rs just basal to
the black mark. The female has a similarly elongate forewing cell but it is not
folded, and there is an areole giving rise to the radial sector branches; this
latter is probably present also in the male but obscured by the folding. The
branching of the veins arising from the areole is variable, but often there are
four in two bifurcate systems arising from the apex of the areole (Fig 2c).
Fig 2c: Thysanoptyx tetragona
Walker
The male genitalia have the
uncus weak, bifid, and the valves relatively short and broad. The aedeagus and
vesica are large, the latter with several diverticula that bear fine to coarse
scobination and cornuti. The saccus is expanded, quadrate or rounded.
The female genitalia of the Sundanian species have a
moderate ductus with a colliculum; this expands into a spherical, somewhat
thickened bursa.
The genus is entirely Oriental. In addition to the
type species and the Sundanian one, there are two more mainland Asian ones: sordida
Butler (N.E. Himalaya); incurvata Wileman
& West (Taiwan).
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