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Trichoblemma Hampson
Type
species: lophophora Hampson,
Burma.
The
shape of the wings and the facies is highly distinctive, as is the elongate flap
of scales extending backwards from the forewing costa in males. The forewings
are elongate, the distal margin convex, the colour pale grey or brownish grey
with broken black transverse fasciae, the postmedial including a larger patch
subdorsally that is particularly conspicuous in the Sundanian species. The
hindwings are darker than the forewings at the costa and the margin, but with
diffusely paler, bands elsewhere. The margin is strongly angled (right-angled in
some species) at CuA2. The abdomen, particularly in the male, extends well
beyond the hindwing.
The male
abdomen has the apodemes of the basal sternite relatively close together, long,
each rather broad and outcurved to a spur, distal to which is a small, rather
square process. The eighth segment has the tergite half the width of the
sternite. The tergite is distally rounded and constricted subbasally, separating
off a pair of short, splayed apodemes. The sternite has lateral rods, slight
posterior bilobing, and a deep concavity in its anterior margin that separates
two broadly triangular apodemes. In the genitalia the uncus is distally
flattened, with a prominent tuft of hairs arising dorsally at its central zone
of greatest flexure. There is a strong scaphium. The vinculum appears to connect
with the tegumen on each side through paratergal sclerites. The valves are
narrow, distally tongue-like beyond a central portion that has small saccular
and costal lobed processes. The juxta is an inverted V-shaped sclerite. The
aedeagus is long and slender, the tapering vesica reflexed, without ornament.
The
female genitalia (major Roepke; Fig 712, Sulawesi) have the ostium within the eighth
segment. It is deeply but narrowly cleft ventrally, and slightly broader than
the ductus. The ductus is long, slender, bent just before it joins the rather
cashew-shaped corpus bursae near it narrower end. The ductus seminalis arises at
the apex of the narrow end. The corpus bursae is very finely scobinate.
The
genus consists of four allopatric species. In addition to the type species and
the Sundanian one, there is T. major Roepke from Sulawesi and an undescribed
one from the Solomons and the islands (Riu, Sudest) adjacent to the south
eastern peninsula of New Guinea.
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