The Saroba group of genera
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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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