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Dilophothripa
Hampson
Type
species: chrysorrhaea
Hampson, India.
This genus contains small species of typical sarrothripine build. The forewing
venation lacks an areole, the radial sector branching being (R2 (R3, R4)). The
hindwing has the veins round the posterior angle of the cell reduced to three,
the anterior two being stalked, as in
Etanna
and Characoma. The hindwing in the male has the tornus densely scaled
with long scales, a feature particularly well developed in the type species. The
facies is variable, but generally similar to that of the previous genera.
The male abdomen lacks tymbals. The eighth segment is distinguished by a
pair of lateral coremata just basal to it. In the genitalia the uncus is similar
to that of Characoma, and the tegumen is expanded ventrally on each side,
particularly strongly in
D.
alopha
Hampson and allies, with hair pencils on pads similar to those of the next
genus. The valves are moderate in size but lack the dark-scaled processes of the
previous genera, though possibly homologous, brown-scaled processes occur at the
interior of the valve in the type species and
D.
olivia
Hampson. The vinculum is developed into an elongate saccus, and the saccular
shield appears broad, tongue-like, within it.
The female genitalia (type species) have narrow but apically rounded ovipositor
lobes, a long, very slender ductus and a sinuously pyriform bursa within which
there is slight scobination in an oblique band and a separate patch.
The genus consists of the species described below and further species
allied to D. alopha such as
D.
lobata
Hampson (N.E. Himalaya to Singapore) and D. brachytorna Hampson (India).
The biology of this complex is discussed below.
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